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y in (-oo:+oo)
(6/7)*y-((3/7)*y) = 4/5+7/5 // - 4/5+7/5
(6/7)*y-((3/7)*y)-(4/5)-(7/5) = 0
(6/7)*y+(-3/7)*y-4/5-7/5 = 0
3/7*y-11/5 = 0 // + 11/5
3/7*y = 11/5 // : 3/7
y = 11/5/3/7
y = 77/15
y = 77/15
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