$\frac{5}{n^2+7n+10}$
$\frac{\left(36x^2-25\right)}{\left(6x-5\right)}$
$3c^2+5-2b+6+7b$
$-1+-3\cdot2$
$x^2-10x-7=0$
$\frac{x-1}{x^3+x}$
$5+2^2-3^2+12-\frac{4}{2}$
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