5 / 4x+7 = 3 / x , Solve for x?

if you cross-multiply (same as multiplying both sides by "x" and then both sides by "4x+7") you get:

5x=12x+21

subtract 12x from both sides and get

-7x=21

divide boths sides by -7 and you have

x=-3

lets check this in the original equation

5/ (4*-3+7)=3/-3
5/(-12+7)=-3/3
5/-5=-1
-1=-1

excellent
keep at it
math is power

5 / 4x+7 = 3 / x

Cross multiply:
3(4x + 7) = 5x
12x + 21 = 5x

7x + 21 = 0
7x = -21
x = -21/7 = -3

5*x= 3*(4x+7)
5x= 12x +21
12x-5x = -21
7x =-21
x=-3

cross multiply

5x=12x+21
subtract 12x from both sides

-7x=21
divide both sides by -7

x=-3

Check by putting -3 in place of x
5/4(-3)+7=3/-3

5/-12+7=3/-3

5/-5=3/-3

-1=-1

Should be written as :-
5 / (4x + 7) = 3 / x
5 x = 12x + 21
- 21 = 7x
x = - 3

5x=12x+21
7x=-21
x=-3

First you're able to strengthen the brackets so which you may get: 3x - 21 + 4x = 5x - 20 then you definately could simplify the two facets to get: 7x - 21 = 5x - 20 Then take the 5x over to the left edge of the equals sign: 2x - 21 = -20 then you definately could take the -20 to the different edge, so this turns right into a beneficial: 2x = -20 + 21 once you paintings this out it turns into: 2x = a million you presently comprehend 2x is a million, so divide this by utilizing 2 to get x: x = a million/2 or 0.5 to examine the respond, positioned x decrease back into the unique equation and make beneficial the two facets equivalent a similar, which they do. desire I even have helped :)

5/(4x + 7) = 3/x
5 = (12x + 21)/x
5x = 12x + 21
5x - 12x = 21
-7x = 21
x = 21/-7
x = -3

Cross multiply and you'll get
5x=3(4x+7)
5x=12x+21 Subtract 12x on both sides
-7x=21 Divide by -7 on both sides
x=-3