$\frac{3x^2}{-x}$
$\left(x+5\right)\left(5x+2\right)$
$5x^2+5xe2x^2+4y^2$
$\left(3x^a-2xy^2\:\right)^3$
$2x^2-3x-5=0$
$\frac{2\sin\left(x\right)-sin\left(2x\right)}{2sin^2x}$
$-27\cdot9$
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