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2x+x=7+2
3x=9
x=3
10=4-2x
10-4=-2x
6=-2x
x=-3
2(x+1)=x
2x+2=x
2x-x=-2
x=-2
-(4+x)=2(3-x)
-4-x=6-2x
-x+2x=6+4
x=10
1-6/7 x=4/7
7-6x=4
-6x=4-7
-6x=-3
x=½
2x=9-x / +x
3x=9 / :3
x=3
b) 10=4-2x /-4
6=-2x / :2
-3=x
c) 2(x+1)=x
2x+2=x / -2x
2=-x / : (-1)
-2=x
d) -(4+x)=2(3-x)
-4-x=6-2x / +4
-x= 10-2x / + 2x
x=10