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Explanation:
[(5x-7) (2x+3)] (7x-8)
first we'll solve the big bracket
(10x^2 +15x-14x-21)(7x-8)
(10x^2+x-21) (7x-8)
70x^3-80x^2+7x^2-8x-147x+168
70x^3-73x^2-155x+168
now solve it by factorisation!
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