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x in (-oo:+oo)
(1/2)/3 = x/5 // - x/5
(1/2)/3-(x/5) = 0
1/6-1/5*x = 0 // - 1/6
-1/5*x = -1/6 // : -1/5
x = -1/6/(-1/5)
x = 5/6
x = 5/6
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