$log3\left(x+15\right)-log3\left(x-5\right)=1$
$\frac{a^2-11a+30}{a-5}$
$352-\left(+651\right)-\left(-275\right)+89+\left(-75\right)$
$-30\::\:-5\::\:1$
$\frac{2.36}{5.4}$
$4cot^2\left(x\right)+1=3$
$13-4x-1-x$
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