$72y+108z$
$4\sin\left(x\right)=5\sin\left(x\right)\cos\left(x\right)$
$yx^{-4}-4x^4-yx^{-4}$
$y-12\left(y+6\right)=y+6\left(y\right)$
$\sqrt[8]{\frac{a^{18}b^7}{a^2b^{-1}}}$
$\left(4x-5\right)\left(3x-7\right)$
$8x-3y-9x+5y-2x+y$
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