$13-\left(-2\right)\times\left(-5\right)+1$
$4x^2-81y^2$
$3x+4=2+4x$
$\frac{3x^3+2x^2-8}{x\:-4}$
$\frac{d}{dx}-\frac{2x}{7}+1$
$\lim_{x\to0}2x$
$\left(-6-5a^6+6\right)-\left(5-5-5a\right)$
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