$\int\frac{20}{x\left(x^2+1\right)}dx$
$\int_0^a\left(x^3e^{x^4+1}\right)dx$
$2\left(\frac{2}{5}x+2\right)=2\frac{2}{5}x+1$
$4\cdot5+4\cdot7$
$56,3-11,05+24.2$
$x^{2\:}+12x=85$
$\left(4+r^2\right)^2$
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