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y in (-oo:+oo)
(2/5)*(y-(4/5)) = -3/10 // + -3/10
(2/5)*(y-(4/5))-(-3/10) = 0
(2/5)*(y-4/5)+3/10 = 0
2/5*(y-4/5)+3/10 = 0
(2/5*10*(y-4/5))/10+3/10 = 0
2/5*10*(y-4/5)+3 = 0
4*y-1/5 = 0
(4*y-1/5)/10 = 0
(4*y-1/5)/10 = 0 // * 10
4*y-1/5 = 0
4*y-1/5 = 0 // + 1/5
4*y = 1/5 // : 4
y = 1/5/4
y = 1/20
y = 1/20
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