$\frac{8^{18}}{8^{13}}$
$\frac{x^3}{x+3}-\frac{9x}{x+3}$
$\frac{2}{x-1}-\frac{3}{x}=2$
$x^2-4x-36$
$3x>2$
$x^2-7x+\frac{48}{2}$
$y'\:+\:y\:=\:x+e^{-x}\:+1$
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