$0.4b-0.2=1.4$
$\left(a-3\right)\left(b+9\right)$
$\int\frac{1}{\sqrt{2x+1}+\sqrt[4]{2x+1}}dx$
$\:\:\frac{5^3}{5^2}$
$16x^2\:+\:56x\:+\:49$
$\int\:\frac{x^4}{x^2-4}dx$
$\lim_{x\to\infty}\left(\left(1-\frac{3}{n}\right)^n\right)$
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