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