$-30x^2+150x\:+4500\ge0$
$7x\:+\:4\:+\:3x\:-\:2$
$y^{4}+7+2y^{2}$
$2.3r_{-1.1r}$
$\left(3x-25\right)\left(3x+5\right)$
$2x^2<18$
$-\frac{18a^8b^4}{42a^5b^7}$
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