$\frac{2x^4+2x-3}{x^2+2x}$
$x^2-\sqrt{5}x+1=0$
$\frac{m^2}{m^3}$
$5t+5\left(1-5t\right)$
$\left(2a+3\right)^{2}=2a$
$17n+18-10n+19$
$\frac{1}{2}x=\frac{1+x}{2}$
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