(6 x-9 )+( 8 x + 24 )- (6 x- 8 )- (10 x-2)- (15 - 10) + (12 - 9x).
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6x-9+8x+24-6x+8-10x-2-15+10+12-9x
=6x+8x-6x-10x-9x-9+24+8+2-15+10+12
=8x-19x-9+34-15+22
= -10x+25+7
= 32-10x
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