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