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