$2m+6m+4m$
$43+51+65-94+12-86$
$-3.6-1.9t+1.7+5.1t$
$\left(-\frac{1}{2}n^2\right)\cdot\left(+\frac{2}{1}n^2\right)$
$20x^2-20x+25$
$\left(2a-3\right)\left(2b-3\right)\left(2c-3\right)$
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