$-67-\left(-45\right)$
$m\left(x+5\right)+n\left(x-5\right)$
$m^2+3m-4$
$-2\left|-3+4-\left(6+9-10-8\right)+5\right|$
$-5x>0$
$f\left(x\right)=\ln^3\left(5x^2-5\right)+\ln\left(x^3\right)$
$\lim_{x\to0}\left(\frac{3x^4-x^3-x^2}{x^3-4x^2+5x}\right)$
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