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-x=-9
9=x
3x+3+30=4x+10-3x
3x-4x+3x=-3-30+10-x+3x=-33+10
2x=-23
23/2=x
3x+12-6x=8-3x+15
3x-6x+3x=-3x+6x-3x
-3x+3x=3x-3x
0=0