$\left(-12x+8z\right)\left(-12x-8x\right)$
$-3\left(w-3\right)=2w-21$
$x2y\:+\:xy2$
$x^2+x=x$
$\lim_{x\to0}\left(e^x+2x\right)^{\left(\frac{1}{x}\right)}$
$12\:+\:10\:\cdot\:-1\:\cdot\:3$
$\left(4n^3\right)^2$
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