$3.8229+3$
$\left(\sqrt{5x-\sqrt{3y}}\right)\left(\sqrt{5x\:+\sqrt{3y}}\right)$
$\left(a^2-11a+18\right)x\left(a-9\right)$
$4-\left(a-3b\right)^2$
$x^2+\frac{6}{3}-x$
$\left(3x^4\:\:\:\:\:\:\:\:\:\:-\:\:2x^2\:\:\:\:\:\:\:\:\:+\:\:5\right)\:\:\left(x\:-\:2\right)\:$
$\:\left(-15\right)\:-\:\left(-18\right)$
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