$\left(z-3\right)\left(z+3\right)$
$\left(2x^{-1}\right)^2$
$2g+g$
$1+\cos\left(2x\right)=\cot\left(x\right)$
$4.25\cdot9$
$4\left(x-2\right)=4\left(x+2\right)$
$y+9=-3y-7$
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