$\int\frac{18}{x^2-x-20}dx$
$y^2-30y-364$
$\int_0^{\sqrt{1-x^2}}dy$
$\int\:\frac{x^2-1}{\left(x-1\right)^2\left(x+2\right)^2}dx$
$\int e^{7x+3}dx$
$29.40-15.20$
$2\:\sqrt{x}-5=\:10\:-\:x$
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