$\frac{x^2+2x+8}{x^4-4x^2}$
$\frac{5}{x+2}-\frac{2x-1}{5}$
$-13\cdot33$
$\log7x=y$
$5x^2-10x-2$
$3x+5=14$
$\frac{dy}{dx}+\frac{y}{x}=2$
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