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x in (-oo:+oo)
x/(3^2) = 5*x-20 // - 5*x-20
x/(3^2)-(5*x)+20 = 0
x/(3^2)-5*x+20 = 0
20-44/9*x = 0 // - 20
-44/9*x = -20 // : -44/9
x = -20/(-44/9)
x = 45/11
x = 45/11
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