$8:8$
$\left(x+y-5\right)^2$
$2+9+1+4+7$
$100x^2-20xy+y^2$
$\frac{x^2+7x+10}{x+3}$
$\left(+5.9\right)+\left(-2.3\right)$
$3b^2-9b$
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