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x in (-oo:+oo)
y = (-8/9)*x-(4/9) // - (-8/9)*x-(4/9)
y-((-8/9)*x)+4/9 = 0
(8/9)*x+y+4/9 = 0
8/9*x+y+4/9 = 0 // - y+4/9
8/9*x = -(y+4/9) // : 8/9
x = (-(y+4/9))/8/9
x = -9/8*(y+4/9)
x = -9/8*(y+4/9)
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