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