$-5y\:-\:5\:=\:-20$
$x^2+y-y^2+3x+4x^2+5y^2+5y$
$-\left(-37\right)-\left(-15\right)$
$x^2-y^3=0$
$4x^{2\:-12x+7}$
$-\frac{1}{2}\left(\frac{3}{4}x\:+\:\frac{3}{2}\right)$
$\lim_{x\to\infty}\frac{x^2}{\sqrt{x^2+1}}$
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