$6k\:x\:7k$
$-18=-x$
$\frac{y'}{t}=\frac{t}{\sqrt{1-t^2}}$
$\log\left(27\right)=3$
$+\left(+8\right)-\left(+15\right)b+\left(-2\right)+\left(-16\right)$
$3^{x+4}.\:3^{x+3}\:$
$-900:\left(-30\right)$
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