21=j+13

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Solution for 21=j+13 equation: 



21=j+13

We move all terms to the left:

21-(j+13)=0

We get rid of parentheses

-j-13+21=0

We add all the numbers together, and all the variables

-1j+8=0

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

-j=-8

j=-8/-1

j=+8

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