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x in (-oo:+oo)
Y-4 = (1/3)*(x-9) // - (1/3)*(x-9)
Y-((1/3)*(x-9))-4 = 0
(-1/3)*(x-9)+Y-4 = 0
Y-1/3*(x-9)-4 = 0
Y-1/3*(x-9)-4 = 0
Y-1/3*x-4+3 = 0
Y-1/3*x-1 = 0
Y-1/3*x-1 = 0
Y-1/3*x-1 = 0 // - Y-1
-1/3*x = -(Y-1) // : -1/3
x = (-(Y-1))/(-1/3)
x = -3*(1-Y)
x = -3*(1-Y)
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