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