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x in (-oo:+oo)
b = (5/7)*(a-11) // - (5/7)*(a-11)
b-((5/7)*(a-11)) = 0
(-5/7)*(a-11)+b = 0
b-5/7*(a-11) = 0
b-5/7*(a-11) = 0
b-5/7*a+55/7 = 0
b-5/7*a+55/7 = 0
x belongs to the empty set
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