$\frac{6}{x-2}-\frac{6}{x+1}=1$
$5x+10=2y-3$
$\frac{6\cdot z}{5}\cdot\frac{\cdot z}{5}$
$4^2-36p^4-16a^2b^2$
$-12.6z-4.9z=-154$
$25-4a^4b^2$
$-3\:x\:10\:x\:-6$
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