$\int\frac{21}{e^{14x-5}}dx$
$x'=k\left(15-x\right)\left(60-x\right)$
$-20\cdot15$
$-2r=-10$
$\int\frac{14x+5}{7x^2+5x-6}dx$
$n^2n$
$\frac{x^2}{x-2}$
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