$y=\frac{x-5}{x^2-25}$
$\frac{2x^2+3}{x^2+1}$
$200x^2-1250$
$56=11+9a$
$12a-27$
$\int\left(2+y^3\right)^2.dy$
$\left(-x^2-4\right)-\left(x^2+x\right)$
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