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x in (-oo:+oo)
Y-3 = (1/6)*(x-9) // - (1/6)*(x-9)
Y-((1/6)*(x-9))-3 = 0
(-1/6)*(x-9)+Y-3 = 0
Y-1/6*(x-9)-3 = 0
Y-1/6*(x-9)-3 = 0
Y-1/6*x-3+3/2 = 0
Y-1/6*x-3/2 = 0
Y-1/6*x-3/2 = 0
Y-1/6*x-3/2 = 0 // - Y-3/2
-1/6*x = -(Y-3/2) // : -1/6
x = (-(Y-3/2))/(-1/6)
x = -6*(3/2-Y)
x = -6*(3/2-Y)
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