$x^4-49y^2$
$\left(a^4+a^3-a^2\right)^2$
$2h^2-7h+2h^2-h+6+4h-9h$
$\left(1-\left(7-5\right)\right)-\left(1-\left(9-6\right)\right)-\left(1-\left(8+5\right)\right)$
$\int x^2\left(4x+1\right)^2dx$
$10x^2-23x+12$
$c^2-7c+120$
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