$12y-14z-5y+8z$
$r^9-1000s^{12}$
$\frac{19}{15}\left(x-2\right)-\frac{5}{3}x=-\frac{4}{3}$
$\frac{dy}{dt}=\frac{y^2+1}{t^2}$
$800-\left(45+\left(\left(8-4\right)+7-2\right)\right)$
$\int ar\cos\left(x\right)dx$
$\lim_{x\to1}\left(\frac{ln\:2x-1}{x-1}\right)$
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