$18-\left(-20\right)$
$\log4x-9=-6$
$\log_b\left(\frac{1}{b}\right)=\:-1$
$3^1\cdot\sqrt{841}+\left(-7\right)^2+\left(-5\right)^3$
$\frac{1}{2}\tan\left(\frac{x}{2}\right)\:+\frac{1}{4}\tan\left(\frac{x}{4}\right)$
$x+7>12$
$\int\:\:\frac{x\:-\:arctg\left(5x\right)}{1+25x^2}dx$
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