Answer:
BEFmZ Is the answer i think
Explanation:
mFBE = 14x + 6
As you can see FBE is sum of FBC + CBE
Given mFBE = mFBC + mCBE
= 10x - 9 + 4x + 15
= 14x + 6
So mZFBE = 14x + 6
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