$-1\:-1\:+6\:+1$
$4r-1=35$
$-4\left(y\:+\:10\right)\:=\:24$
$\left(5ab\right)\left(25a^2b^2+15abc+ac^2\right)$
$\lim_{x\to0}\left(\frac{2-\cos\left(x\right)}{x^4}\right)$
$\frac{3z^5-15z^3+6z}{9z}$
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