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-[2x+7-[-1+3x+4x-9-3x-4]-29]=-3
-[2x+7-[-1-9-4+3x+4x-3x]-29]=-3
-[2x+7-[-14+4x]-29]=-3
-[2x+7+14-4x-29]=-3
-[2x-4x+7+14-29]=-3
-[-2x-8]=-3
2x+8=-3
2x=-3-8
2x=-11
x=-11/2
x=-5,5