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Y in (-oo:+oo)
Y/25 = 14/21 // - 14/21
Y/25-(14/21) = 0
Y/25-2/3 = 0
1/25*Y-2/3 = 0 // + 2/3
1/25*Y = 2/3 // : 1/25
Y = 2/3/1/25
Y = 50/3
Y = 50/3
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