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y in (-oo:+oo)
(6/7)*y = 15/18 // - 15/18
(6/7)*y-(15/18) = 0
(6/7)*y-5/6 = 0
6/7*y-5/6 = 0 // + 5/6
6/7*y = 5/6 // : 6/7
y = 5/6/6/7
y = 35/36
y = 35/36
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