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y in (-oo:+oo)
(2/3)*y-(1/3) = 7/3 // - 7/3
(2/3)*y-(1/3)-(7/3) = 0
(2/3)*y-1/3-7/3 = 0
2/3*y-8/3 = 0 // + 8/3
2/3*y = 8/3 // : 2/3
y = 8/3/2/3
y = 4
y = 4
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