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(4/5)*(y-1)-(16/5) = -4 // + 4
(4/5)*(y-1)-(16/5)+4 = 0
(4/5)*(y-1)-16/5+4 = 0
4/5*(y-1)-16/5+4 = 0
(4/5*5*(y-1))/5-16/5+(4*5)/5 = 0
4/5*5*(y-1)+4*5-16 = 0
4*y-20+20 = 0
4*y = 0
(4*y)/5 = 0
(4*y)/5 = 0 // * 5
4*y = 0
4*y = 0 // : 4
y = 0
y = 0
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