Jon S. answered 10/07/20
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By angle addition rule: m<ABF + m<EBF = m<ABE
Substituting the expressions given in the problem:
6x + 26 + 2x - 9 = 11x - 31
solve for x then plug value of x into expression for m<ABF (6x + 26).
Mark M.
Or possibly ABE + EBF = ABF!10/07/20