(8-x)[(7-x)(3-x)-16]
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=>8-x(21-10x+xsq-16)
=>168-80x+8xsq-128-21x+10xsq-xcube+16x
=>xcube+18xsq-85x+40
=>168-80x+8xsq-128-21x+10xsq-xcube+16x
=>xcube+18xsq-85x+40
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