$\left(2a+1\right)\left(1+2b\right)$
$-16+x=5$
$5x^2\:+\:39x\:+\:54$
$75:\left(-3\right)$
$\lim_{x\to-1}\left(\frac{7x^4+4x^3+x-2}{x+1}\right)$
$\int_0^{\infty}\frac{\ln\left(x+1\right)}{x\sqrt{x}}dx$
$ln\left(48e^x\right)$
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