$5\cdot3\cdot4-2\cdot27\cdot4+3\cdot\left(-2\right)\cdot16-30$
$p-\left(r+2\right)^2$
$-6^2+4x-x^2+15$
$\frac{x^2}{27x^3+1}$
$-2.22+11.11-\left(-0.8\right)$
$y=\left(-x^3+3\right)\left(-2x+5x^{-2}-5\right)$
$\frac{m^2-1}{m-7}$
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