$\frac{x^2-81}{x+9}$
$\left(\frac{3}{4}\sqrt{x}-\sqrt{y}\right)\left(\frac{3}{4}\sqrt{x}+\sqrt{y}\right)$
$\left(-6956\right)-7138$
$\frac{6x^2-xy-2x^2}{y+2x}$
$\frac{x^3-1}{x^2-4}$
$4.5x\:+\:6y\:-3.5x\:+7$
$5x+10y=82$
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