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y in (-oo:+oo)
(-4/5)*y = 1/10-(9/10) // - 1/10-(9/10)
(-4/5)*y-(1/10)+9/10 = 0
(-4/5)*y-1/10+9/10 = 0
4/5-4/5*y = 0 // - 4/5
-4/5*y = -4/5 // : -4/5
y = -4/5/(-4/5)
y = 1
y = 1
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