$3r-t+s;\:r=7;\:s=-5;t=8$
$4a^2b-16c^2$
$3[4-\left(7-2\right)]$
$\left(6x-z\right)^2$
$\frac{dy}{dx}-6x\left(x+2\right)=2$
$y^3+sy^2$
$\left(-100\right)-\left(172\right)$
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