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y in (-oo:+oo)
y/2-y-(4/5) = 23/10 // - 23/10
y/2-y-(4/5)-(23/10) = 0
y/2-y-4/5-23/10 = 0
-1/2*y-31/10 = 0 // + 31/10
-1/2*y = 31/10 // : -1/2
y = 31/10/(-1/2)
y = -31/5
y = -31/5
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