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x in (-oo:+oo)
y-4 = (-2/3)*(x-6) // - (-2/3)*(x-6)
y-((-2/3)*(x-6))-4 = 0
(2/3)*(x-6)+y-4 = 0
2/3*(x-6)+y-4 = 0
2/3*(x-6)+y-4 = 0
2/3*x+y-4-4 = 0
2/3*x+y-8 = 0
2/3*x+y-8 = 0
2/3*x+y-8 = 0 // - y-8
2/3*x = -(y-8) // : 2/3
x = (-(y-8))/2/3
x = 3/2*(8-y)
x = 3/2*(8-y)
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