$15a^2-6ab-8a^2-25-15ab+3+15a^2+ab$
$3\left(2b-1\right)-7=6b-10$
$\lim_{x\to5}\left(\frac{x^2+10x+25}{x^2-10x+25}\right)$
$\sqrt{18x^4+36x^2+18}$
$\sqrt[3]{\left(-8\right)\left(2\right)}^{-2}$
$x^2<-9$
$-21+6^2b^{36}+a^2b^4$
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