$\left(\frac{\left(20m^2n-mn\right)}{9x^2-30xy+25y^2}\right)\left(\frac{n^2+n}{m^2-n^2}\right)$
$+5-1-23-56-9-8-7$
$5^{\left(2x^{2\:}-5x\right)}=125$
$5.6\cdot10^5$
$x4-100$
$-33.42\:-\left(-110.02\right)$
$\int_{12}^{20}\left(x\right)dx$
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