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y in (-oo:+oo)
(2/3)*y = 4/7 // - 4/7
(2/3)*y-(4/7) = 0
(2/3)*y-4/7 = 0
2/3*y-4/7 = 0 // + 4/7
2/3*y = 4/7 // : 2/3
y = 4/7/2/3
y = 6/7
y = 6/7
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