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x in (-oo:+oo)
H = (5/7)*(a+2*b) // - (5/7)*(a+2*b)
H-((5/7)*(a+2*b)) = 0
(-5/7)*(a+2*b)+H = 0
H-5/7*(a+2*b) = 0
H-5/7*(a+2*b) = 0
H-5/7*a-10/7*b = 0
H-5/7*a-10/7*b = 0
x belongs to the empty set
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