A ∠A and ∠ B ∠B are complementary angles. If m ∠ A = ( 2 x − 2 9 ) ∘ ∠A=(2x−29) ​∘ ​​ and m ∠ B = ( x + 2 3 ) ∘ ∠B=(x+23) ​∘ ​​ , then find the measure of ∠ B ∠B. ?