Work Step by Step
We know that angle Q is equal to $b-a$, meaning that $b-a$ is equal to 42 degrees. Because all triangles add to 180 degrees, we obtain: $ 180 = 180 - 2b + 2a + M \\ 2b - 2a = M \\ 2(b-a) = M \\ M = 2(42) = 84$
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