$x^2\:+\:\frac{2}{3}x\:+\:\frac{1}{9}$
$\frac{x^4+3x^2+0-2}{x-2}$
$-5x+x-6x$
$25m^2-36b^2$
$-20\cdot6\cdot\left(-14\right)\cdot\left(-7\right)\cdot\left(-2\right)$
$\left(\sqrt{7}+\sqrt{5}\right)\left(\sqrt{7}-\sqrt{5}\right)+\left(\sqrt{2}+1\right)\left(\sqrt{2}-1\right)$
$3.2-5+4.3-8+5.2$
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