$0.9^2+8\left(6.4-3.28\right)$
$x^2-28x+28$
$y=ty-2y+t-2$
$5^{-2x}=5^{3x}$
$\frac{dy}{dx}\:6x^{-2}+3x-8$
$y^2-6y=0$
$m^2-36m+324$
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