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y in (-oo:+oo)
1-(2*y) = (4*y-1)/5 // - (4*y-1)/5
1-((4*y-1)/5)-(2*y) = 0
1-((4*y-1)/5)-2*y = 0
(-1*(4*y-1))/5-2*y+1 = 0
(-1*(4*y-1))/5+(-2*5*y)/5+(1*5)/5 = 0
1*5-1*(4*y-1)-2*5*y = 0
1-14*y+5 = 0
6-14*y = 0
(6-14*y)/5 = 0
(6-14*y)/5 = 0 // * 5
6-14*y = 0
6-14*y = 0 // - 6
-14*y = -6 // : -14
y = -6/(-14)
y = 3/7
y = 3/7
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