what is (5x + 5 + 6x - 7x + 8x - 9x + 2x)(7x - 8x + 9x - 6x - 5x - 2x - 3x - 4x - x) = ?
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(5x + 5 + 6x - 7x + 8x - 9x + 2x)(7x - 8x + 9x - 6x - 5x - 2x - 3x - 4x - x)
= - 13x(5x + 5)
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