$3q=18$
$-10x^2+7x+25\ge0$
$\frac{4}{x}-\frac{x-1}{5}=\frac{14}{15}$
$\frac{d^2}{dx^2}\left(-x^2+y^2=5\right)$
$0.04x^4-1.2x^3+0.09x^2$
$a^4-3a^3+5a^2b^2$
$2x\cdot\left(7x-9\right)-6x\cdot\left(2x+1\right)$
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