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x in (-oo:+oo)
180-b = (1/2)*(b-a) // - (1/2)*(b-a)
180-((1/2)*(b-a))-b = 0
(-1/2)*(b-a)-b+180 = 0
180-1/2*(b-a)-b = 0
180-1/2*(b-a)-b = 0
1/2*a-3/2*b+180 = 0
1/2*a-3/2*b+180 = 0
x belongs to the empty set
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