$-2c+8+9c=7c+7$
$\lim_{x\to0}\left(\frac{n}{n+1}\right)^n$
$-2x+12=2x+4$
$.80=\ln\left(y\right)$
$7\left(x^2+2x-4\right)$
$\left(8x^2-5y\right)^2$
$\frac{dy}{dx}\left(cos\:x+3sen\:3y=2\right)$
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