$5x\cdot10y$
$-5\left(r+5\right)$
$-x^2+1\ge0$
$-6-\left(-3+5-2+1\right)-3-\left(-3+2\right)$
$\left(\frac{3}{2}-5b\right)-\left(-2+7b\right)+\left(-1-11b\right)$
$11a+8a+9a+a$
$\sqrt[5]{x}=-\frac{2}{245}$
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