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