$144y^2-9\left(x^2-36\right)$
$\left(5x\:-\:a\right)\:\left(x\:-\:2a\right)\:=\:5x\:\left(x-a\right)$
$7\left(7x-9\right)$
$\int_0^145n^{-0.7}vdv$
$9:\left(-3\right)+8\cdot\left(-5\right)+36$
$\int\left(\frac{-7x}{x-6}\right)dx$
$36^2+84+49$
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