$5x-7=4x+3$
$\left(c+7\right)\left(c+4\right)$
$-10x^3y^{-6}z^3$
$12ax^2-27a$
$cos\left(t\right)\left(\frac{dy}{dt}\right)+sen\left(t\right)y=1$
$20+x=40$
$\lim_{x\to0}\left(1\:+\:sin\:7x\right)^{\frac{1}{x}}$
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