Question 682482
{{{x(5+2x)^2-3(5+2x)}}}
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{{{x(25+20x+4x^2)-15-6x}}}
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{{{25x + 20x^2 + 4x^3 - 15 - 6x}}}
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{{{highlight_green(4x^3 + 20x^2 + 19x - 15)}}}
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