(4с-3)(2-5)+20с^2 = 8с - 20с - 6 + 15 + 20с^2 = 20с^2 - 12с + 9
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(4с-3)(2-5)+20с^2 = 8с - 20с - 6 + 15 + 20с^2 = 20с^2 - 12с + 9