6j+15=3j-21

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Solution for 6j+15=3j-21 equation: 



6j+15=3j-21

We move all terms to the left:

6j+15-(3j-21)=0

We get rid of parentheses

6j-3j+21+15=0

We add all the numbers together, and all the variables

3j+36=0

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

3j=-36

j=-36/3

j=-12

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