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y in (-oo:+oo)
(1/2)*y-(1/3) = 1/7 // - 1/7
(1/2)*y-(1/3)-(1/7) = 0
(1/2)*y-1/3-1/7 = 0
1/2*y-10/21 = 0 // + 10/21
1/2*y = 10/21 // : 1/2
y = 10/21/1/2
y = 20/21
y = 20/21
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