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x in (-oo:+oo)
(4/9)*(y+3) = x // - x
(4/9)*(y+3)-x = 0
4/9*(y+3)-x = 0
4/9*(y+3)-x = 0
4/9*y-x+4/3 = 0
4/9*y-x+4/3 = 0
4/9*y-x+4/3 = 0 // - 4/9*y+4/3
-x = -(4/9*y+4/3) // * -1
x = 4/9*y+4/3
x = 4/9*y+4/3
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