$5\left(5\right)^3-7\left(5\right)^2\left(4\right)+4^3$
$125+\left(-220\right)-\left(-120\right)$
$5x^2y+13x^2y$
$x^2+12x+40$
$-3+5+4-8+3+8-2-7-9$
$25x^4\:m^2+30x^2\:my+9y^2$
$\left(2ab^3\right)^7$
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