Question

X+4=x+2

2x-9+12

10x+7x-3=4x+1

4-3(x+3)=(-8)

Answer 1

X+4=x+2
x-x=2-4
0=-2

2x-9+12
2x= 3 / :2
x=1,5

10x+7x-3=4x+1
17x-3=4x=1
17x-4x=1+4
13x=5 / :13
x=5/13

4-3(x+3)=(-8)
4-3x-9=-8
-3x=-8-4+9
-3x=-3 / :(-3)
x=1