$\left(2\cdot3^{-2}\right)^3\left(5\cdot3^2\right)^2$
$15a+21a-13a+8a-12a+7a$
$9\left(-4\right)-6\left(-6\right)-7\left(3-8\right)$
$2-x\le14-4x$
$\frac{4}{1-\sin\left(x\right)}+\frac{4}{1+\sin\left(x\right)}$
$7-10-5-4+6-1$
$3-x=\sqrt{x-1}$
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