$10\cdot10\cdot\left(-10\right)$
$\int\left(xe^{5x^2+7}\right)dx$
$x+2x+5x-4y+7y-5y$
$=\frac{a^{m+3}}{a^{m+3}}$
$\left(a-b+1\right)^2-\left(1-a-b\right)^2$
$15mn-5m\cdot7mn+10mn\cdot5mn\:+3mn$
$6\left(5-2-1\right)+4\left(5-4-7\right)-5\left(-2\right)$
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