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x in (-oo:+oo)
Y-1 = (2/3)*(x-2) // - (2/3)*(x-2)
Y-((2/3)*(x-2))-1 = 0
(-2/3)*(x-2)+Y-1 = 0
Y-2/3*(x-2)-1 = 0
Y-2/3*(x-2)-1 = 0
Y-2/3*x-1+4/3 = 0
Y-2/3*x+1/3 = 0
Y-2/3*x+1/3 = 0
Y-2/3*x+1/3 = 0 // - Y+1/3
-2/3*x = -(Y+1/3) // : -2/3
x = (-(Y+1/3))/(-2/3)
x = 3/2*(Y+1/3)
x = 3/2*(Y+1/3)
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