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m∠5 + m∠6 = 90°
Since ∠5 and ∠6 are complementary angles, their sum is equal to 90°.
Therefore, m∠6 = 90° - 39°
m∠6 = 51°
So, the correct equation to solve for m∠6 is:
m∠6 = 90° - m∠5