$\left(-3-9\right)-\left(8+7\right)$
$\lim_{x\to0}\left(\frac{3x^2+4x}{e^{-x}-1}\right)$
$3x^2+24x-60$
$25x^2+60xyz+36y^2\:z^2$
$3x+1=19$
$-6v-7v+8v=20$
$\left(a-b\right)^2=\left(b-a\right)^2$
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