$\frac{4x^2}{x^2+9}$
$\left(3a^2y^5-11\right)^2$
$3.01\cdot0.11$
$\frac{6x^2+15x+7}{x+2}$
$\left(\frac{x}{x+1}\right)^4$
$4x-y=-9$
$x^2+4x=13$
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