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x in (-oo:+oo)
y = 12-((6*x)/2) // - 12-((6*x)/2)
(6*x)/2+y-12 = 0
3*x+y-12 = 0 // - y-12
3*x = -(y-12) // : 3
x = (-(y-12))/3
x = (12-y)/3
x = (12-y)/3
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