$-6-2y^2+6x+1+7y^2-y^2$
$\left(0.3a^4-1.2b^3\right)^3$
$\frac{x^3+64}{x+4}$
$5\cdot37$
$\frac{x}{5}=-2$
$a^2-4\:\:\:\:a^2-b^2$
$3.8m^3\left(2-6.6m+0.5m^2\right)$
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