$\frac{x^3}{x^2+6x+9}-\frac{36}{x^2+6x+9}$
$128-y^7$
$f\left(x\right)=\frac{1}{3x}-\frac{2}{3}\:\:\:$
$10-\left(-400\right)$
$x^5-40x^4$
$20-\left(-18\right)+8\left(-2\right)$
$\left(-5r^7s^3\right)\left(9r^4s^6\right)$
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