$20a^2+23a-7$
$4,6s-0,4s+0,4$
$2x^2\:-4$
$\left(6n+5\right)\left(6n-9\right)$
$\frac{x^3-7x+1}{2x^2-8}$
$\int\left(e^{2x}\sqrt{10+e^x}\right)dx$
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