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Y-4 = (2/3)*(x-8) // - (2/3)*(x-8)
Y-((2/3)*(x-8))-4 = 0
(-2/3)*(x-8)+Y-4 = 0
Y-2/3*(x-8)-4 = 0
Y-2/3*(x-8)-4 = 0
Y-2/3*x-4+16/3 = 0
Y-2/3*x+4/3 = 0
Y-2/3*x+4/3 = 0
Y-2/3*x+4/3 = 0 // - Y+4/3
-2/3*x = -(Y+4/3) // : -2/3
x = (-(Y+4/3))/(-2/3)
x = 3/2*(Y+4/3)
x = 3/2*(Y+4/3)
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