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x in (-oo:+oo)
20/15 = x/60 // - x/60
20/15-(x/60) = 0
4/3-1/60*x = 0 // - 4/3
-1/60*x = -4/3 // : -1/60
x = -4/3/(-1/60)
x = 80
x = 80
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