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y in (-oo:+oo)
(3/5)*y-(1/7) = 1/2 // - 1/2
(3/5)*y-(1/7)-(1/2) = 0
(3/5)*y-1/7-1/2 = 0
3/5*y-9/14 = 0 // + 9/14
3/5*y = 9/14 // : 3/5
y = 9/14/3/5
y = 15/14
y = 15/14
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