$x^2+2x-20$
$\left(\frac{1}{2}x+\frac{1}{3}y\right)\left(\frac{1}{2}x-\frac{1}{3}y\right)$
$\left(\frac{3}{4}a+b\right)^3$
$-4x+5y;\:x=2\:;\:y=4$
$-16^0$
$-100+45-34-34-45-18-\left(-1\right)$
$\left(-3\right)^4-5\left(-3\right)^2-\left(-3\right)+16$
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