Simplify :
(5x-7) (2x+3) (7x-8)
(5x-7) (2x+3) (7x-8)
[5x(2x+3) - 7(2x+3)] (7x-8)
(10x2+15x - 14x - 21)(7x - 8)
(10x2+x - 21) (7x - 8)
7x(10x2+x - 21) - 8(10x2+x - 21)
70x3+7x2 - 147x - 80x2 - 8x + 168
70x3 - 73x2 + 155x + 168
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