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x in (-oo:+oo)
45/54 = x/6 // - x/6
45/54-(x/6) = 0
5/6-1/6*x = 0 // - 5/6
-1/6*x = -5/6 // : -1/6
x = -5/6/(-1/6)
x = 5
x = 5
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