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y in (-oo:+oo)
(-1/9)*(y+4) = (1/9)*(y-(2/5)) // - (1/9)*(y-(2/5))
(-1/9)*(y+4)-((1/9)*(y-(2/5))) = 0
(-1/9)*(y+4)+(-1/9)*(y-2/5) = 0
-1/9*(y+4)-1/9*(y-2/5) = 0
-1/9*(y+4)-1/9*(y-2/5) = 0
-2/9*y-2/5 = 0
-2/9*y-2/5 = 0
-2/9*y-2/5 = 0 // + 2/5
-2/9*y = 2/5 // : -2/9
y = 2/5/(-2/9)
y = -9/5
y = -9/5
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