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x in (-oo:+oo)
y-3 = (8/9)*(x-(1/2)) // - (8/9)*(x-(1/2))
y-((8/9)*(x-(1/2)))-3 = 0
(-8/9)*(x-1/2)+y-3 = 0
y-8/9*(x-1/2)-3 = 0
y-8/9*(x-1/2)-3 = 0
y-8/9*x-3+4/9 = 0
y-8/9*x-23/9 = 0
y-8/9*x-23/9 = 0
y-8/9*x-23/9 = 0 // - y-23/9
-8/9*x = -(y-23/9) // : -8/9
x = (-(y-23/9))/(-8/9)
x = -9/8*(23/9-y)
x = -9/8*(23/9-y)
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