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x in (-oo:+oo)
y = (6-x)/3 // - (6-x)/3
y-((6-x)/3) = 0
(-1*(6-x))/3+y = 0
(-1*(6-x))/3+(3*y)/3 = 0
3*y-1*(6-x) = 0
x+3*y-6 = 0
(x+3*y-6)/3 = 0
(x+3*y-6)/3 = 0 // * 3
x+3*y-6 = 0
x+3*y-6 = 0 // - 3*y-6
x = -(3*y-6)
x = 6-(3*y)
x = 6-(3*y)
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