$\frac{2x^4-2x^3+4x^2-5}{+2}$
$\sqrt{x^2}+25$
$x^9+2x^2-x-2$
$\left(2y+3+4x\right)^2$
$x^2+10x+10$
$\frac{x^2+7x-1}{x-1}$
$81-b^2$
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