$7x-3\:\cdot\:4+2x$
$-4\left(3\right)^2+4\left(3\right)-4$
$y^2-10y-11$
$9y^5\left(3x+4y\right)$
$22^2+33+7$
$\left(7m^2-5mn+6n^2\right)-\left(5m^2-8mn-n^2\right)$
$15^6\cdot15^{-6}$
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