$\left(5x^2-4x-3\right)^2$
$-2x^2-20x-47$
$\left(-a+26b\:\right)^2$
$18a^3b^2\:\:\:12a^5b^3\:\:\:48a^2b^4$
$25\cos\left(x+73.7\right)=15$
$-9\sqrt{21}-16\sqrt{21}$
$x\ln\left(2\right)=4x\ln\left(3\right)+4x$
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