$\left(3+2\right)\cdot\sqrt{4}\cdot\left(2+1\right)^2$
$-13z+yz+9z+7y-7yz$
$-316+-1$
$7x^4-15x^3-18x^2+x-3$
$\frac{1}{x}-\frac{1}{2x}=\frac{1}{6}$
$m^2-2m$
$-\sin\left(x\right)=0$
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