$\left(4x+3\right)\left(5x-3\right)$
$-\frac{3}{2x}+2+\frac{1}{2x}$
$-20x^6-40x^6$
$580-85$
$\left(a+7\right)\left(x+3\right)$
$\lim_{x\to3}\:\:x^3+5x^2+10x+25$
$\left(2x^{2}y^{4}-3x^{4}y\right)^{2}$
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