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y in (-oo:+oo)
(2/5)*(y+4/5) = (4/5)*(y-(1/5)) // - (4/5)*(y-(1/5))
(2/5)*(y+4/5)-((4/5)*(y-(1/5))) = 0
(2/5)*(y+4/5)+(-4/5)*(y-1/5) = 0
2/5*(y+4/5)-4/5*(y-1/5) = 0
2/5*(y+4/5)-4/5*(y-1/5) = 0
12/25-2/5*y = 0
12/25-2/5*y = 0
12/25-2/5*y = 0 // - 12/25
-2/5*y = -12/25 // : -2/5
y = -12/25/(-2/5)
y = 6/5
y = 6/5
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