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x in (-oo:+oo)
y = (12-(2*x))/6 // - (12-(2*x))/6
y-((12-(2*x))/6) = 0
y-((12-2*x)/6) = 0
(-1*(12-2*x))/6+y = 0
(-1*(12-2*x))/6+(6*y)/6 = 0
6*y-1*(12-2*x) = 0
2*x+6*y-12 = 0
(2*x+6*y-12)/6 = 0
(2*x+6*y-12)/6 = 0 // * 6
2*x+6*y-12 = 0
2*x+6*y-12 = 0 // - 6*y-12
2*x = -(6*y-12) // : 2
x = (-(6*y-12))/2
x = (12-(6*y))/2
x = (12-(6*y))/2
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