$x^2+6x+9=x^2-10x+25$
$7-9+3-1+4$
$\left(2+3x^2+x^3\right)\cdot\left(x^2-1+4x\right)$
$7-\sqrt{x+2}=3$
$\frac{x^2+2x+4}{x-2}$
$\frac{x^2+3x-6}{x^2-2x-8}$
$\left(9-g\right)^2$
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