$x^2+8x=12$
$x\:dy\:+\:x^2\:dx\:=0,\:y\left(1\right)=0.2$
$xy-2x+3.5xy-11x$
$\lim_{x\to1}\left(\frac{\sqrt{1+2x}-\sqrt{1-4x}}{x}\right)$
$x^2-2x-143$
$\frac{x^3}{x^2}-4$
$\int\left(x^3+9\right)^73x^2dx$
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