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