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x in (-oo:+oo)
y-1 = (5/9)*(x-4) // - (5/9)*(x-4)
y-((5/9)*(x-4))-1 = 0
(-5/9)*(x-4)+y-1 = 0
y-5/9*(x-4)-1 = 0
y-5/9*(x-4)-1 = 0
y-5/9*x-1+20/9 = 0
y-5/9*x+11/9 = 0
y-5/9*x+11/9 = 0
y-5/9*x+11/9 = 0 // - y+11/9
-5/9*x = -(y+11/9) // : -5/9
x = (-(y+11/9))/(-5/9)
x = 9/5*(y+11/9)
x = 9/5*(y+11/9)
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