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