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