$m\:^2\:\left(3a+2\right)\:^2$
$3k+18dk+9d+6k^2$
$75ab+25a^2b^2-5a^3b^3$
$4x+5y\:=21$
$182.5+42.25$
$15-\left(-32\right)$
$\lim_{x\to\infty}\:\left(20-\left(\frac{2x^3+3x+1}{x^3+4}\right)^2\right)$
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