$k^2+2k+1$
$3x^2-x+x^2+3x$
$3y^2+8y+4$
$40+\frac{x-40}{6}=80+\frac{y-80}{6}$
$\frac{10\left(30\right)}{6}$
$s^2+3s-2$
$5\cdot6+8$
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