$4x^2-\:20x\:+\:25$
$\left(\sqrt{2x^2}\right)^4$
$81x^2-3x+36$
$f^2x-2fg=\left(f-g\right)^2$
$\left(9x^2-16b^2\right)^2$
$2n^3-7n^3+3n^3$
$x^2-\frac{1}{5}x=\frac{2}{5}$
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