$13x+7y-4x+5$
$x^2+6x+90=55$
$\left(5x^3\right)\left(4x^2-6x-8\right)$
$\lim_{x\to0}\left(\frac{x-1-e^{x-2}}{1-\cos\left(2\pi x\right)}\right)$
$\left(x+1\right)\left(\sqrt{2-x}\right)$
$x^3+2x+4;\:x=-3$
$\frac{2+8.7178}{2}$
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