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y in (-oo:+oo)
1/4-((2/8)*y) = 4/5 // - 4/5
1/4-((2/8)*y)-(4/5) = 0
(-1/4)*y+1/4-4/5 = 0
-1/4*y-11/20 = 0 // + 11/20
-1/4*y = 11/20 // : -1/4
y = 11/20/(-1/4)
y = -11/5
y = -11/5
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