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y in (-oo:+oo)
3/7-(5/7) = (-1/7)*y-((4/7)*y) // - (-1/7)*y-((4/7)*y)
(4/7)*y-((-1/7)*y)+3/7-(5/7) = 0
(1/7)*y+(4/7)*y+3/7-5/7 = 0
5/7*y-2/7 = 0 // + 2/7
5/7*y = 2/7 // : 5/7
y = 2/7/5/7
y = 2/5
y = 2/5
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