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Y in (-oo:+oo)
(6/7)*Y-(1/5) = 1/3 // - 1/3
(6/7)*Y-(1/5)-(1/3) = 0
(6/7)*Y-1/5-1/3 = 0
6/7*Y-8/15 = 0 // + 8/15
6/7*Y = 8/15 // : 6/7
Y = 8/15/6/7
Y = 28/45
Y = 28/45
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