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Answer:
m5 = 57° and m7 = 57°
Step-by-step explanation:
We know that:
m4 = m8
m5=m7
Which means that:
m8=123°
m5+m8=180° since it is a line
Computations:
m5+123°=180°
m5=57°
since m5 = m7, m7 also equals 57°