$\left(+16\right)-\left(-4\right)$
$18-\left(-3\right)$
$y^2+2y^2+4y^2-5y^2$
$\int_1^{\infty}\left(\frac{-2}{\sqrt{x+2}}\right)dx$
$-3.8x=\:-7.6$
$x^2+8x-29=0$
$\lim_{n\to5}\left(\cos\left(\frac{n}{\pi}\right)\right)$
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