$121r^3s^4+77r^2s^4-55r^4s^3$
$\frac{9m^2n}{-4mn^2}$
$\left(-7m-3\right)^2$
$\left(-15\right)-\left(-39\right)$
$x^3\left(3x^2-x+2x^{-1}\right)$
$\log50+\log\left(20\right)$
$\frac{x^2-5x+3}{x^1-4}$
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