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x in (-oo:+oo)
5/9 = x/45 // - x/45
5/9-(x/45) = 0
5/9-1/45*x = 0 // - 5/9
-1/45*x = -5/9 // : -1/45
x = -5/9/(-1/45)
x = 25
x = 25
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