$81x^4-16$
$\left(4x^2+6x+3\right)-\left(5x^4+4x-3\right)$
$\left(e^x\right)^2+5$
$\frac{dy}{dx\:}+\frac{y}{2}=\frac{1}{2}e^{\frac{x}{3}}$
$3\left(x^2yz^3\right)^{-2}$
$3c^2+5-2b+6+7b$
$\:-\left(-8+6\right)-\left[-4+2-\left(-5+8\right)\right]$
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