Explanation:
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- JM is an angle bisector of ∠ ZJF.
 - ∠ ZJM = (2x - 15)° , ∠ MJF = ( 1x + 13 ) °
 
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~Set up an equation & solve for x : 
 
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[ Since JM is a angular bisector of ∠ ZJF , ∠ ZJM = ∠ MJF ]
~ Move 1x to left hand side and change it's sign. Likewise , Move 15 to right hand side and change it's sign
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