3x-{-4x+[5x-(12x-10)]+2}
=3x-{-4x+[5x-12x+10]+2}
=3x-{-4x+[10-7x]+2}
=3x-{-4x+10-7x+2}
=3x-{12-11x}
=3x-12+11x
=14x-12
3x-{-4x+{5x-(12x-10]+2}
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