數學!.!

4-3x=7
-3x=7-4
-3x=3
x=-1

7y=2y+4
7y-2y=4
5y=4
y=4/5


3y-2=2y
3y-2y=2
y=2

6m+5=3m+8
6m-3m=8-5
3m=3
m=1

3(m+1)=9
m+1=3
m=2

3(2m+1)-4m=5
6m+3-4m=5
6m-4m=5-3
2m=2
m=1

4-3x=7
3x=7-4
x=3/3
x=1

7y=2y+4
7y-2y=4
5y=4
y=4/5
y=0.8

3y-2=2y
3y=2y+2
3y-2y=2
y=2

6m+5=3m+8
6m=3m+8-5
6m=3m+3
6m-3m=3
3m=3
m=3/3
m=1

3(m+1)=9
m+1=9/3
m+1=3
m=3-1
m=2

3(2m+1)-4m=5
3(2m+1)=5+4m
2m+1=(5+4m)除以3
2m+1=3分之5+3分之4m
2m-3分之4m+1=3分之5
3分之6m-3分之4m+1=3分之5
3分之2m=3分之5-1
3分之2m=3分之2
m=3分之2除以3分之2
m=1

4-3x=7
4-7=3x
3x= -3
x= -3/3
x= -1


7y=2y+4
7y-2y=4
5y=4
y=4/5


3y-2=2y
3y-2y=2
y=2

6m+5=3m+8
6m-3m=8-5
3m=3
m=3/3
m=1


3(m+1)=9
3m+3=9
3m=9-3
3m=6
m=6/3
m=2


3(2m+1)-4m=5
6m+3-4m=5
2m=5-3
2m=2
m=2/2
m=1

4 – 3X = 7 (move 3X to the other side to make it positive)
4 = 7 + 3X (move 7 to other side)
4 – 7 = 3X
-3 = 3X
-3 ÷ 3 = X
-1 = X

7y = 2y + 4 (move 2y to the other side)
7y – 2y = 4
5y = 4
y = 4 ÷ 5
y = 0.8
prove 7 x 0.8 = (2 x 0.8) + 4
so 5.6 = 1.6 + 4

3y – 2 = 2y (move 2y and -2 to the other side)
3y – 2y = 2
y = 2
prove (3 x 2) – 2 = 2 x 2,
so 6 – 2 = 2

6m + 5 = 3m + 8 (move m in one side and number on the other side)
6m – 3m = 8 – 5
3m = 3
m = 1
prove (6 x 1 ) + 5 = (3 x 1) +8
so 7+5 = 4 + 8

3(m+1) = 9 (solve the blanket first)
3m + 3 = 9
3m = 9 – 3
3m = 6
m = 6 ÷ 3
m = 2
prove 3(2+1) = 9
so 3 x 3 = 9

3(2m+1) – 4m = 5 (solve the blanket first)
6m + 3 – 4m = 5 (move m in one side and number on the other side)
6m – 4m = 5 – 3
2m = 2
m = 2 ÷ 2
m = 1
prove 3((2x1) +1) – (4 x 1) = 5
so 3(2 + 1) – 4 = 5
so 6 + 3 – 4 = 5
so 9 – 4 = 5
so 5 = 5

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1. 4-3x=7
4-7 = 3x
-3 = 3x
x = -1

7y=2y+4
7y-2y=4
5y =4
y = 4/5

3y-2=2y
3y-2y = 2
y=2

6m+5=3m+8
6m-3m = 8-5
3m = 3
m =1

3(m+1)=9
m+1 = 3
m=3-1
m=2

3(2m+1)-4m=5
6m +3 -4m =5
2m =5-3
2m = 2
m=1

4-3x=7
3X=7-4
3X=3
X=1

7y=2y+4
7y-2y=4
5y=4
y=4/5

3y-2=2y
3y=2y+2
3y-2y=2
y=2/3

6m+5=3m+8
6m-3m=8-5
3m=3
m=1

3(m+1)=9
3m+3=9
3m=9-3
3m=6
m=2

3(2m+1)-4m=5
6m+3-4m=5
2m=5-3
2m=2
m=1

7y=2y+4
2y+4=7y
(2+7)y+4=7y
9y+4=7y
y=5y