$36x-49xe3$
$\frac{3}{x}-\frac{4}{x+2}$
$-1\left(40\right)-25+4$
$\left(2a^{3}-5b^{4}\right)^{2}$
$\frac{\sqrt{x^2-16}}{\frac{x^2}{x^2+1}}$
$\left(n^2-1\right)\left(n^2+2m\right)$
$-\left(-5\right)+\left(-8+12\right)-\left(-6\right)$
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