$\left(9x+z\right).\left(9x-z\right)$
$\left(2x+z\right)\left(2x-w\right)$
$e=\frac{2^{x+5}-2^{x+3}}{2^x}$
$\left(-5\right)-\left(-7\right)+2.\left(-3\right)$
$\int e^22xdx$
$y^2-6y-315$
$-72\cdot11$
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