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x in (-oo:+oo)
Y = (2/3)*(x-4) // - (2/3)*(x-4)
Y-((2/3)*(x-4)) = 0
(-2/3)*(x-4)+Y = 0
Y-2/3*(x-4) = 0
Y-2/3*(x-4) = 0
Y-2/3*x+8/3 = 0
Y-2/3*x+8/3 = 0
Y-2/3*x+8/3 = 0 // - Y+8/3
-2/3*x = -(Y+8/3) // : -2/3
x = (-(Y+8/3))/(-2/3)
x = 3/2*(Y+8/3)
x = 3/2*(Y+8/3)
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