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y in (-oo:+oo)
(4/5)*(y+4) = (1/8)*(y+4) // - (1/8)*(y+4)
(4/5)*(y+4)-((1/8)*(y+4)) = 0
(4/5)*(y+4)+(-1/8)*(y+4) = 0
4/5*(y+4)-1/8*(y+4) = 0
4/5*(y+4)-1/8*(y+4) = 0
27/40*y+27/10 = 0
27/40*y+27/10 = 0
27/40*y+27/10 = 0 // - 27/10
27/40*y = -27/10 // : 27/40
y = -27/10/27/40
y = -4
y = -4
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