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y in (-oo:+oo)
(7/12)*y = 1/3 // - 1/3
(7/12)*y-(1/3) = 0
(7/12)*y-1/3 = 0
7/12*y-1/3 = 0 // + 1/3
7/12*y = 1/3 // : 7/12
y = 1/3/7/12
y = 4/7
y = 4/7
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