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