21=j+6

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Solution for 21=j+6 equation: 



21=j+6

We move all terms to the left:

21-(j+6)=0

We get rid of parentheses

-j-6+21=0

We add all the numbers together, and all the variables

-1j+15=0

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

-j=-15

j=-15/-1

j=+15

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