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