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x in (-oo:+oo)
Y-8 = (2/3)*(x-1) // - (2/3)*(x-1)
Y-((2/3)*(x-1))-8 = 0
(-2/3)*(x-1)+Y-8 = 0
Y-2/3*(x-1)-8 = 0
Y-2/3*(x-1)-8 = 0
Y-2/3*x-8+2/3 = 0
Y-2/3*x-22/3 = 0
Y-2/3*x-22/3 = 0
Y-2/3*x-22/3 = 0 // - Y-22/3
-2/3*x = -(Y-22/3) // : -2/3
x = (-(Y-22/3))/(-2/3)
x = -3/2*(22/3-Y)
x = -3/2*(22/3-Y)
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