$8s^2+2s$
$\left(42\right).\left(-23\right)$
$\left(3^8\right)^4$
$-2\cdot\left(-1\right)^2-4\cdot\left(-1\right)+6$
$x^2+y^2-45=0$
$\frac{x-3}{\sqrt{x}-2}+\frac{4}{\sqrt{x}-1}$
$11m^2+20m-22^2m$
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