$\frac{3}{x-1}+\frac{1}{x}=2$
$23\cdot161+38$
$z^8+12z^8+144$
$\frac{12x^3}{x-3}$
$\frac{1}{2}x^4y^2-\frac{1}{4}x^2y^3$
$-3xy+12x^3\:;\:x=2\:;\:y=3$
$2.052\:x\:10^3$
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