$3\sqrt{75}-4\sqrt{12}+\sqrt{27}$
$10+4h-8h-1$
$b+5<-13$
$\ \left(2x^4+6x^3-5x^2-27x-18\right)$
$25a^2b^2\:-\:4c^2$
$y'-\frac{1}{x+2}$
$x^3+2x+4;\:x=-3$
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