$\left(3x^{3}+13x^{2}-13x+2\right):\left(3x-2\right)$
$\left|-16-\left(-5\right)\right|+\left(-2\right)\cdot6-8$
$-8\cdot15+13$
$18:\left(-5+\left(-3.2+5\right)\right)$
$\lim_{x\to\infty}\frac{3^x-1}{\sqrt{x^7+x^3}}$
$\frac{db}{dt}+2b=50,\:b\left(1\right)=60$
$64-b^3$
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