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y in (-oo:+oo)
(5/12)*y-(2/3) = (-7/12)*y-(5/6) // - (-7/12)*y-(5/6)
(5/12)*y-((-7/12)*y)-(2/3)+5/6 = 0
(5/12)*y+(7/12)*y-2/3+5/6 = 0
y+1/6 = 0 // - 1/6
y = -1/6
y = -1/6
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