$\left(wz+3xy\right)\left(-wz+3xy\right)$
$\left(2\cdot\left(-5\right)\right)\cdot6$
$x+2=3x+8$
$4\:-\:52\:-\:72\:+\:39$
$6\left(s+3t\right)$
$\int\frac{2\sqrt{81-100x^2}}{5}dx$
$2x^2+2x-2$
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