$\lim_{x\to2}\left(\ln\left(x+\right)\right)$
$8xy-20y+6xy^2-15y^2$
$\frac{-4x^2-3x^3+x^4-5}{x-4}$
$\frac{3x^3+3x^2+3x-1}{x+1}$
$225n^{4}-40$
$2x^2+4x+3=0$
$5a^2b+4ab^2+a^2b-2ab^2$
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