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y in (-oo:+oo)
(3/7)*y = 9/14 // - 9/14
(3/7)*y-(9/14) = 0
(3/7)*y-9/14 = 0
3/7*y-9/14 = 0 // + 9/14
3/7*y = 9/14 // : 3/7
y = 9/14/3/7
y = 3/2
y = 3/2
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