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y in (-oo:+oo)
(4*y)/7-(7/8) = 5/56 // - 5/56
(4*y)/7-(7/8)-(5/56) = 0
(4*y)/7-7/8-5/56 = 0
4/7*y-27/28 = 0 // + 27/28
4/7*y = 27/28 // : 4/7
y = 27/28/4/7
y = 27/16
y = 27/16
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