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