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2x+x=7+2
3x=9 /:3
x=3
10=4-2x /-4
6=-2x
-2x=6 /:(-2)
x= -3
-(2x+1)=4
-2x-1=4 /+1
-2x=5 /:(-2)
x= -5/2
2(x+1)=x
2x+2=x /-x -2
2x-x=-2
x=-2
2x-(3x+1)=6
2x-3x-1=6 /+1
-x=7
x= -7
-(4+x)=2(3-x)
-4-x=6-2x
x= 10
1/3x-2=x+2 /*3
x-6=3x+6 /-3x +6
-2x=12
x= -6
1-6/7x=4/7 /*7
7-6x=4 /-7
-6x=-3
x= 3/6
x= 1/2