$r^2+9r+18$
$b^2-18b+81$
$\int\frac{\frac{4}{15}x+\frac{61}{15}}{\left(x^2+1\right)}dx$
$x^2-16x-3=0$
$x^6+5xy^3y^2-24y^4$
$3x^2-18x+9$
$169y^2-25$
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