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$\frac{5^{-2}}{3^{-2}}$
$2\left(4x-3\right)=18$
$2\:2+3\left[\:2-1\right]\:-3\:\:-\:\left[\:3-2\left(-3\right)-1\:\right]+2$
$x^2-28x+4$
$2y-y^2$
$-1+6-3$
$s^2-12s+36$
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