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7-3(x+1)=x-3(x-1)
7-3x-3=x-3x+3
4-3=-2x+3x
1=x
2.
7x+5-2=8+4-2
7x+3=10
7x=10-3
7x=7
x=7/7
x=1
3.
5-(2x-4)=9-(2+3x)
5-2x+4=9-2-3x
-2x+9=7-3x
-2x+3x=7-9
x=-2
4.
(3x+1)-(x+3)=3(x+1)
3x+1-x-3=3x+3
2x-2=3x+3
2x-3x=3+2
-x=5
x=-5