$\left(+7\right)-\left(+4+1\right)-\left(-3+4\right)$
$\left(z-5w\right)\left(2+5w\right)$
$xy-5y+6y$
$15-3-\left(-15\right)$
$\frac{dy}{dx}=xy+2x-3y-6$
$-3x+2>10$
$-5\sqrt{2a}$
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