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8x-3x=-b+9
5x=9-b
x=9-b/5
b)2(x+4)=x-4
2x+8=x-4
2x-x=-4-8
x=-12
c)-4(x-1)=3(x-3)
-4x+4=3x-9
-4x-3x=-9-4
-7x=-13
x=-13/7
x=-1 6/7