$\frac{2x^2-4x-\left(x^2-4\right)}{\left(x-2\right)^2\left(x+2\right)}$
$71=5y-14$
$5x^2+9x=-4$
$1+b^3$
$\lim_{x\to1}\left(-\frac{1}{\left(x-1\right)}\right)$
$2x-5^3$
$\left(m^4n-3.5\right)^2$
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