7j-21=3j+7

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Solution for 7j-21=3j+7 equation: 



7j-21=3j+7

We move all terms to the left:

7j-21-(3j+7)=0

We get rid of parentheses

7j-3j-7-21=0

We add all the numbers together, and all the variables

4j-28=0

We move all terms containing j to the left, all other terms to the right

4j=28

j=28/4

j=7

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