$\left(2l-m+3n\right)^2$
$\left(3xy+4z\right)^2$
$3\left(-1\right)^2$
$\frac{b}{b^{-7}}$
$2a^3bc^2+3a$
$-1\:\left(-4\right)\left(4\right)\left(-2\right)$
$k+\frac{\left(3-k\right)}{3}$
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