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y in (-oo:+oo)
2/3 = 3/4-((1/2)*y) // - 3/4-((1/2)*y)
(1/2)*y+2/3-(3/4) = 0
(1/2)*y+2/3-3/4 = 0
1/2*y-1/12 = 0 // + 1/12
1/2*y = 1/12 // : 1/2
y = 1/12/1/2
y = 1/6
y = 1/6
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