$4+3-\left(-6\right)-7$
$\left(m^2-n\right)^3$
$\left(8x-3\right)\left(8x-55\right)$
$\frac{dx}{dt}+sec^2\left(t\right)x=sec^2\left(t\right)$
$2.14-20$
$20x^2+20xy+5y^2$
$\left(7m-\frac{2}{5}n\right)^2$
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