$\frac{6+12}{2}$
$1-\left(98+\left(-67\right)-\left(-32\right)+\left(-12\right)-5\right)$
$x^2+4x+7$
$2x-y\frac{dy}{dx}=3$
$\left(\frac{5}{7}ab+1.3a\right)^2$
$4x+12x^3-8xy+16x^2y$
$1^{-44}$
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