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y in (-oo:+oo)
(-5/8)*y-y+4/5 = (1/40)*(y+1) // - (1/40)*(y+1)
(-5/8)*y-((1/40)*(y+1))-y+4/5 = 0
(-1/40)*(y+1)+(-5/8)*y-y+4/5 = 0
(-5*y)/8-1/40*(y+1)-y+4/5 = 0
(-1/40*5*8*(y+1))/(5*8)+(-5*5*y)/(5*8)+(5*8*(-y))/(5*8)+(4*8)/(5*8) = 0
5*8*(-y)-1/40*5*8*(y+1)-5*5*y+4*8 = 0
32-26*y-40*y-1 = 0
32-66*y-1 = 0
31-66*y = 0
(31-66*y)/(5*8) = 0
(31-66*y)/(5*8) = 0 // * 5*8
31-66*y = 0
31-66*y = 0 // - 31
-66*y = -31 // : -66
y = -31/(-66)
y = 31/66
y = 31/66
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