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x in (-oo:+oo)
Y-9 = (1/3)*(x-3) // - (1/3)*(x-3)
Y-((1/3)*(x-3))-9 = 0
(-1/3)*(x-3)+Y-9 = 0
Y-1/3*(x-3)-9 = 0
Y-1/3*(x-3)-9 = 0
Y-1/3*x-9+1 = 0
Y-1/3*x-8 = 0
Y-1/3*x-8 = 0
Y-1/3*x-8 = 0 // - Y-8
-1/3*x = -(Y-8) // : -1/3
x = (-(Y-8))/(-1/3)
x = -3*(8-Y)
x = -3*(8-Y)
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