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y in (-oo:+oo)
(5/7)*y-(1/3) = 1/2 // - 1/2
(5/7)*y-(1/3)-(1/2) = 0
(5/7)*y-1/3-1/2 = 0
5/7*y-5/6 = 0 // + 5/6
5/7*y = 5/6 // : 5/7
y = 5/6/5/7
y = 7/6
y = 7/6
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