$43-242$
$1x^2-16x+c$
$77.4+5.61+8.776$
$\left(-4-1\right)\left(15-20\right)$
$\left(\frac{2}{3x}\right).\frac{4}{12}$
$5.3u-\left(n-6.4\right)$
$\int\frac{x^2+3x+2}{\left(x^2+1\right)\left(x-1\right)}dx$
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