$y+x+y+y+x$
$\left(3n^{-2}\right)^{-1}$
$4x^2-16x\cdot16$
$\left(-8x-4y+7z\right)+\left(9x-18y-6z\right)+\left(-4x+24y+32\right)$
$\left(-3x^2y^{-1}\right)\left(-xy^2\right)$
$\frac{z}{-2}+\:-6=\:-8$
$\lim_{x\to0}\frac{\cot\left(3x\right)}{\cot\left(6x\right)}$
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