$6m+8n-12m-4n$
$\left(7m+1\right)^2$
$\left(2x+y\right)\:\left(x-2y\right)$
$-x^2-4x-1$
$\left(-\frac{2}{5}m^6n^3-\frac{4}{3}m^2n^5\right)^2$
$\left(6x^2-3x+2\right)-\left(-3x^3+2x^2-5\right)$
$3x+2y+z=5$
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