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y in (-oo:+oo)
(3/8)*y-(1/2) = 1/7 // - 1/7
(3/8)*y-(1/2)-(1/7) = 0
(3/8)*y-1/2-1/7 = 0
3/8*y-9/14 = 0 // + 9/14
3/8*y = 9/14 // : 3/8
y = 9/14/3/8
y = 12/7
y = 12/7
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