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y in (-oo:+oo)
4*(y-(1*3)) = 4/5 // - 4/5
4*(y-(1*3))-(4/5) = 0
4*(y-3)-4/5 = 0
(4*5*(y-3))/5-4/5 = 0
4*5*(y-3)-4 = 0
20*y-64 = 0
(20*y-64)/5 = 0
(20*y-64)/5 = 0 // * 5
20*y-64 = 0
20*y-64 = 0 // + 64
20*y = 64 // : 20
y = 64/20
y = 16/5
y = 16/5
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