$6b\left(-2b\right)$
$4\left(r+2\right)+5\left(r+2\right)$
$xy=100$
$y'\cdot\:\left(1+e^y\right)=e^{x-y}$
$x+2=-2$
$\left(7+4v\right)\left(7-4y\right)$
$a^6+6a^3+9$
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