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x in (-oo:+oo)
5/60 = x/40 // - x/40
5/60-(x/40) = 0
1/12-1/40*x = 0 // - 1/12
-1/40*x = -1/12 // : -1/40
x = -1/12/(-1/40)
x = 10/3
x = 10/3
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