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y in (-oo:+oo)
(5/7)*y+(1/7)*y = 5/3+5/3 // - 5/3+5/3
(5/7)*y+(1/7)*y-(5/3)-(5/3) = 0
(5/7)*y+(1/7)*y-5/3-5/3 = 0
6/7*y-10/3 = 0 // + 10/3
6/7*y = 10/3 // : 6/7
y = 10/3/6/7
y = 35/9
y = 35/9
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