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x in (-oo:+oo)
W = (6/7)*(u+6*v) // - (6/7)*(u+6*v)
W-((6/7)*(u+6*v)) = 0
(-6/7)*(u+6*v)+W = 0
W-6/7*(u+6*v) = 0
W-6/7*(u+6*v) = 0
W-6/7*u-36/7*v = 0
W-6/7*u-36/7*v = 0
x belongs to the empty set
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