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x in (-oo:+oo)
Y+8 = (2/3)*(x-4) // - (2/3)*(x-4)
Y-((2/3)*(x-4))+8 = 0
(-2/3)*(x-4)+Y+8 = 0
Y-2/3*(x-4)+8 = 0
Y-2/3*(x-4)+8 = 0
Y-2/3*x+8/3+8 = 0
Y-2/3*x+32/3 = 0
Y-2/3*x+32/3 = 0
Y-2/3*x+32/3 = 0 // - Y+32/3
-2/3*x = -(Y+32/3) // : -2/3
x = (-(Y+32/3))/(-2/3)
x = 3/2*(Y+32/3)
x = 3/2*(Y+32/3)
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