$y-\left(3y\right)$
$\frac{x^2-1}{-x}-x$
$\left(\frac{1}{3}a^3-\frac{4}{5}\right)^2$
$\left(7+k\right)^2$
$\frac{5\:x^4+6x^3-2x^2-x\:+7}{x^2+1}$
$\frac{x^3+12x+3}{x^2-1}$
$\frac{2}{\tan\left(x\right)+\cot\left(x\right)}=2\sin\left(x\right)\cos\left(x\right)$
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