$2y''+10y'+12y=0$
$5y\:+\:45$
$-3\left\{5-4\left[-2\left(3-8+1\right)-8\right]-2+9\right\}$
$\frac{12}{x^2}-\frac{15}{x^2}+\frac{3}{x^2}-\frac{5}{x^2}$
$\lim_{x\to0}\left(\left(\frac{e^{2x}-1}{3x^2+2x}\right)\right)$
$a^2+30a+225$
$2x-3y\left(2x+3y\right)$
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