3(j-1)=18

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Solution for 3(j-1)=18 equation: 



3(j-1)=18

We move all terms to the left:

3(j-1)-(18)=0

We multiply parentheses

3j-3-18=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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