$\frac{dy}{dx}=\frac{x}{\sqrt{7x+4}}$
$\left(-4+5+3\right)-\left(-2+6\right)$
$x^3+2x^2+xy^2+2x^2+4xy+2y^2$
$y'=e^{-t}$
$27-\left(16-25\right)$
$3a\:+\:4b\:-\:7a\:+5b$
$4x^4-12x^3+9x^2$
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