$\frac{\frac{1}{5}-\frac{1}{5}}{5-5}$
$x^2-3x+7$
$6w+2z-3w+4z$
$\int\left(\frac{4}{9-x}\right)dx$
$\left(-5x+1\right)\left(3x+4\right)$
$\left(3x^3-8y\right)\left(3x^3+8y\right)$
$\left(x^2+3\right)^{2\:}e^{3x}$
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