$4\ln\left(x+4\right)=-4$
$6x\:+\:5y\:+22x\:-\:13y$
$2x^2-142=20$
$2b^2-6b+4$
$\frac{8x^6}{x^8}$
$\left(1\sqrt{3}\right)^2$
$\frac{d^2}{dx^2}\frac{x^2-4x}{\left(x-2\right)^2}$
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