3(j-3)=12

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Solution for 3(j-3)=12 equation: 



3(j-3)=12

We move all terms to the left:

3(j-3)-(12)=0

We multiply parentheses

3j-9-12=0

We add all the numbers together, and all the variables

3j-21=0

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

3j=21

j=21/3

j=7

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