$-\sqrt{72}18\sqrt{100}-\frac{70}{9}8.25$
$\left(a^2-\:ab\:+\:b^2\right)\left(a^2-\:b^2\:+\:ab\right)\:$
$\left(a-28\right)^2$
$\int\left(\frac{\frac{2}{\sqrt{x}}}{\sqrt{4x}-\sqrt{x}}\right)dx$
$-16\left(4\left(-8.2+4\left(5\right)-3+16\left(2.8\right)-4\right)\right)$
$\left(\frac{1}{2}-\frac{3}{4}\cdot\frac{2}{3}\right)$
$x+4+x+8$
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