$16x^2+x+25$
$7a-5a+a$
$\frac{7x^5-22+3x^3-2}{-x+2}$
$4\left(a-2\right)^2+12\left(a-2\right)\left(a+5\right)+9\left(a+5\right)$
$6a^2b-4a^3b^2+10a^4b^3+8a^5b^4$
$\left(2x-3\right)\left(2x-9\right)$
$\left(mn+2\right)^2$
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