Part A :
So the two sides are equivalent,
[tex]9x - 18 = 3x[/tex]
Solve for x and get 3.
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Answer : x = 3
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Part B :
To find JM, simply substitute x for 3 and solve,
[tex]9(3) - 18[/tex]
[tex]27 - 18 = 9[/tex]
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Answer : JM = 9
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I hope that helps you out!!
Any more questions, please feel free to ask me and I will gladly help you out!!
~Zoey