$\frac{\sqrt{x+3}}{\sqrt{6-2x}+\sqrt{9-x}}$
$4x+7>39$
$\:6\left(s+5\right)$
$\frac{dq}{dt}+\frac{2}{10+2t}q=4\:\:\:\:,\:\:\:\:q\left(2\right)=100$
$5\left(-1\right)\left(3\right)$
$2\sin\left(x\right)-\sin\left(2x\right)$
$2.63+1.80+3.67$
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