$9x+2-8$
$9x^2+18x-16=\:0$
$80x^5-5x$
$\lim_{x\to\infty}\left(\frac{5+x}{x}\right)^{2x}$
$4x-\frac{1}{5\:}\:\:\:4x+\frac{1}{5}$
$\left(x^2+1\right)y'+xy=3x^3$
$u^2-4u+4$
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