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