$3x-27<18$
$\frac{x+1}{x^2-1}$
$\frac{0.0666666}{2\left(0.3333\right)-0.6}$
$\frac{x^2+6x+8}{x^2-4}$
$\left(-18\right)-\left(-4\right)$
$\left(-1\right)^4\cdot\left(\frac{7}{4}\right)\cdot x^3\cdot\left(\frac{1}{x}\right)^4$
$4-9n^2$
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