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