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y in (-oo:+oo)
(2*y)/7-(7/8) = 9/56 // - 9/56
(2*y)/7-(7/8)-(9/56) = 0
(2*y)/7-7/8-9/56 = 0
2/7*y-29/28 = 0 // + 29/28
2/7*y = 29/28 // : 2/7
y = 29/28/2/7
y = 29/8
y = 29/8
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