$5x\:-13\:=\:43\:-\:2x$
$\frac{2}{5}x-8=12$
$\lim_{x\to4}\left(\frac{x^3+3x^2+2x}{x+2}\right)$
$\left(x+\frac{1}{x}\right)^28$
$\csc\left(89.5\right)$
$\lim_{x\to-1}\left(\frac{\sin\left(x+1\right)}{\left(x+1\right)}\right)$
$4c^2-12c+9$
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