$-5k-11k$
$9x^2-90x+72$
$w\left(w-6\right)+9$
$\left(y+\frac{5}{2}\right)^2$
$-2.04^2$
$\left(-4+23\right)+\left(5-10\right)-\left(45-9\right)$
$a^4-a^2b^2+\frac{b^2}{4}$
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