$\left(\frac{2}{3}x+y\right)^2$
$8\left(\frac{2}{3}\right)^3-17\left(\frac{2}{3}\right)^2+12\left(\frac{2}{4}\right)+14$
$\sqrt{-56}$
$20-15mas\:45$
$\sqrt{\frac{x}{y+2}}$
$y=\frac{1}{2}x+6$
$7x^2b-21xb+49b^2$
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