$3x-2y\cdot y+2x$
$-2y^3+3y+7y^3+1+2-5$
$\frac{1}{x}.\frac{x+1}{x^2+x}.\frac{x^4-1}{x^2-1}$
$\frac{dy}{dx}=\frac{e^{2x}}{y+e^2y}$
$7m^2-49$
$+4x\left(-3\right)$
$k^2\:-\:11k\:+\:28$
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