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