$2\:+\:20z\:-\:8z\:+\:5\:x\:7$
$\frac{1-z^3}{\left(1+\sqrt{2}\right)\left(1-\sqrt{z}\right)}$
$\left(12xy-5\right)\:\left(12xy+5\right)$
$\sin\left(x\right)=-0.62$
$\frac{x^3-3x+9}{3}$
$\left(4m+12n\right)\left(4m-12n\right)$
$2x\left(3y+4\right)+3\left(3y+4\right)$
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