$7a+5b+8c+\left(-3a\right)+\left(-6b\right)+\left(-8c\right)$
$8\left(s+6\right)$
$11r-7r-6r$
$\lim_{x\to3}\left(\frac{-4.9t^2+44.1}{t-3}\right)$
$\lim_{x\to\pi}\left(\frac{sin\left(x\right)}{sin\left(x+\pi\right)}\right)$
$81x^4-4$
$420\cdot2+526+120\cdot3$
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