$x^{2}+3xy+2y^{2}+4x+7+3$
$99\cdot80$
$\frac{12c}{\left(4c^3\right)^2}$
$laplace\:\left\{e^{9t}\right\}$
$10x-y=30$
$\lim x\to0\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$\frac{3x^2+x+1}{x+1}$
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