$a^2+10a+21$
$\left(x^2-y\right)dx-xdy=0\:$
$52,7\cdot3,5$
$\:7-x-\left(-5x\right)-10+4x$
$\frac{10x^8y}{5x^8}$
$\left(2x+5\right)\left(2x-y\right)$
$\:3\cdot3\cdot3\cdot3$
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