$\lim_{x\to\infty}\left(\frac{-2+x}{x}\right)^{3x}$
$x^2+8x<-15$
$105^2$
$f\left(x\right)=x^3+13x^2$
$-3a+8=5a+24$
$-45\:x\:-11$
$5x^2+7x^2+8x^2+6x^2$
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