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x in (-oo:+oo)
12/20 = x/45 // - x/45
12/20-(x/45) = 0
3/5-1/45*x = 0 // - 3/5
-1/45*x = -3/5 // : -1/45
x = -3/5/(-1/45)
x = 27
x = 27
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