$\:3\left(-2\right)\:+3\left[\:2-\left(-1\right)2\right]-2$
$y''\:-\:6y'\:+\:25y\:=\:0$
$7a^2-15b^3+5b^2+9a^2-4b^3$
$w^2+14w+7^2$
$\frac{d}{dx}\left(ln\left(7x\right)\right)^{ln\left(5x\right)}$
$121x^2+22xy+y^2$
$x^2+30x-225$
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