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y in (-oo:+oo)
(6/7)*y = 2/3 // - 2/3
(6/7)*y-(2/3) = 0
(6/7)*y-2/3 = 0
6/7*y-2/3 = 0 // + 2/3
6/7*y = 2/3 // : 6/7
y = 2/3/6/7
y = 7/9
y = 7/9
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