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y in (-oo:+oo)
(5*y)/7 = 3/4 // - 3/4
(5*y)/7-(3/4) = 0
(5*y)/7-3/4 = 0
5/7*y-3/4 = 0 // + 3/4
5/7*y = 3/4 // : 5/7
y = 3/4/5/7
y = 21/20
y = 21/20
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