8x+5x-7x+3-x=48?

2008-02-20 5:32 am
i dont understand this at all!! i need help??

回答 (13)

2008-02-20 9:59 am
✔ 最佳答案
5x = 45
x = 9
2008-02-21 9:34 pm
8x + 5x - 7x + 3 - x = 48
13x - 7x + 3 - x = 48
6x + 3 - x = 48
6x +3 - 3 - x = 48 - 3
6x + 0 - x = 45
6x - x = 45
5x = 45
5x / 5 = 45 / 5
x = 9
2008-02-20 9:04 am
8x + 5x - 7x + 3 - x = 48
13x - 7x - x = 48 - 3
6x - x = 45
5x = 45
x = 45/5
x = 9
2008-02-20 5:48 am
X=9
2008-02-20 5:41 am
you can put all the figures with "x " together, and move the figure without "x", namely, 3 to right, that is : 8x+5x-7x-x=48-3
5x=45
x=9
2008-02-20 5:41 am
First combine all of your X terms, which is pretty much just adding and subtracting all of the things that have x in front of it.

so 8x+5x-7x-1x or 8+5-7-1
(the one is because there is an implied on in front of that last X.)

this becomes 5x+3=48

then you have to subtract the three from both sides of the equation but not the 5x because you can't, it has a variable in front of it.

5x=45

now you divide the five on both sides of the equation causing the fives to cancel out on the side with the x, thus you are left with the answer to x!

x=(45/5)

x=9
2008-02-20 5:39 am
well get all like terms together.
(8x+5x-7x-x)+3=48
so 8x + 5x = 13x
13x -7x = 6x
6x -x = 5x

so far 5x+3=48
subtract the three from both sides.
5x+3=48
-3 -3
then you get 5x=45
divide each side by 5 to get x by itself.
5x=45
5 5

then you get x=9.
and there's your answer.
參考: in my brain from 7th grade =)
2008-02-20 5:39 am
It means 5x + 3 = 48 or 5x = 45 or x = 9.

x (8+5-7-1) + 3 = 48
5x + 3 = 48
5x = 48 - 3
5x = 45
x = 45/5 = 9

Hope this helps!
2008-02-20 5:37 am
Add the like terms, then solve for x.

8x + 5x - 7x + 3 - x = 48

(8x + 5x - 7x - x) + 3 = 48

5x + 3 = 48

(subtract 3 from both sides of the equation)

5x = 45

(divide by 5)

x = 9
2008-02-20 5:36 am
First combine all the x's.
8x+5x-7x-x
13x-8x
5x+3=48
Subtract 3 from each side
5x=45
Divide each side by 5
x=9
2008-02-20 5:35 am
8x+5x-7x+3-x = 48
5x + 3 = 48
5x = 45
x = 9


收錄日期: 2021-05-01 10:08:00
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080219213240AABolPm

檢視 Wayback Machine 備份