$9c-6+c$
$\left(7a^2-b\right)\left(3a-2\right)$
$27m^6-12u^6$
$cosx-1=cos2x$
$-\frac{1}{2}\ln\left(3-2y\right)=\ln\left(x\right)+c$
$x-16=-32$
$4x^2-7x-4$
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