$\left(7x^3\right)\left(4x^2-2x-1\right)$
$-9w=-63$
$50ab+125ab$
$x^2+y^2=n^2$
$2x^4-4^3-5x-2$
$\frac{d}{dx}\left(y=x^2cos2^x\right)$
$6x^2-3y^2=1$
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