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-x-1=8-3x(3x+3)
-x-1=8(3x3x+3x3)
-x-1=8-(9x+3x3)
-x-1=8-(9x+9)
-x-1=8-9x-9
-x-1=-1-9x
-x+9x=-1+1
8x=-1+1
8x=0
8x/8=0
x=0