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-x+4=4-x
-x+4=-2x+4
b)-1/3x=3
-1/3x=-1/3x
-1/3x=3x
c)2(x+2)-x+8=18
2(x+2)-x+8=x+12
2(x+2)-x+8=x+17
d) 15x - 5 (2+3x) = x
15x - 5 (2+3x) = -10
15x - 5 (2+3x) =10