$2-4n$
$5\left(8k+2\right)$
$36x^2-\:+25$
$\left(3x-1\right)\left(2-x\right)$
$\left(16-9\right)\cdot7-35+\frac{\left(39-15\right)}{3}$
$2xy^2+x^2y'=y^2$
$x^3\cdot e^x^2$
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