$\left(-72\right)\left(+8\right)$
$2a+3b-7=15$
$2\left(-3\right)\left(-5\right)$
$\left(\frac{1}{3}\right)\left(6\right)$
$6a^2+18a^2b-30a^6c$
$\frac{\left(x+n\right)^7-x^7-n^7}{x+2n}$
$w+6=0$
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