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y in (-oo:+oo)
4*y-((3*y-1)/7) = -7 // + 7
4*y-((3*y-1)/7)+7 = 0
(-1*(3*y-1))/7+4*y+7 = 0
(-1*(3*y-1))/7+(4*7*y)/7+(7^2)/7 = 0
4*7*y-1*(3*y-1)+49 = 0
25*y+1+49 = 0
25*y+50 = 0
(25*y+50)/7 = 0
(25*y+50)/7 = 0 // * 7
25*y+50 = 0
25*y+50 = 0 // - 50
25*y = -50 // : 25
y = -50/25
y = -2
y = -2
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