86-(15x-7(6x-9)-2(10x-5(2-3x)
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86-(15x-7(6x-9)-2(10x-10-15x) 86-(15x-7(6x-9)-2(-10-5x) 86-(15x-42x-63+20+10x) 86-(-17x-43) 86+17x+43 129+17x
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