$6abc+4abd+2ab$
$\left(-1\right)^3\left(-1\right)^3$
$c^2-6c-7$
$\frac{2x^2y^{-2}}{2y}$
$\left(b^2+5a\right)^3$
$4c-20cd+25d^2$
$\frac{2}{7}q+2=8$
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