$9-3a=15$
$x^2+14x\:+7$
$6^2+6\cdot5+5^2$
$\frac{x^8-1}{x-1}$
$\left(x^2+3x+1\right)\left(x^2+5x+2\right)$
$m^6-1$
$\left(-2\right)^{17}$
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