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y in (-oo:+oo)
1/4-((1/5)*(y-1)) = 5*y // - 5*y
1/4-((1/5)*(y-1))-(5*y) = 0
(-1/5)*(y-1)-5*y+1/4 = 0
1/4-1/5*(y-1)-5*y = 0
(-1/5*4*(y-1))/4+(-5*4*y)/4+1/4 = 0
1-1/5*4*(y-1)-5*4*y = 0
4/5-104/5*y+1 = 0
9/5-104/5*y = 0
(9/5-104/5*y)/4 = 0
(9/5-104/5*y)/4 = 0 // * 4
9/5-104/5*y = 0
9/5-104/5*y = 0 // - 9/5
-104/5*y = -9/5 // : -104/5
y = -9/5/(-104/5)
y = 9/104
y = 9/104
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