$\left(4x-20y+3z\right)^2$
$\left(6\cdot8\right)-\left(2\cdot4\right)+30$
$\lim\:_{x\to\:0}1-\frac{1}{\sqrt{1-x}}$
$\left(81x^2+108x+36\right)\left(3\right)$
$5x-15\le35x+165$
$\left(\left(-3\right)^2\left(-2\right)^3\left(-5\right)\right)^2$
$\left(+3ny\right)-\left(-2ny\right)$
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