$6\cdot\left\{3\cdot\left[-9+4\left(5\cdot3-9\right)\right]\right\}$
$125x^3+y^3$
$78^2-72$
$49a^2+84ab+36b^2$
$25x^2-35x+49$
$x^2+y^2=-2xy+6x$
$x^4-2x^4$
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