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(J)=14J+7(J)=7J+42
We move all terms to the left:
(J)-(14J+7(J))=0
We add all the numbers together, and all the variables
J-(+21J)=0
We get rid of parentheses
J-21J=0
We add all the numbers together, and all the variables
-20J=0
J=0/-20
J=0
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