21=4j+7+2

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Solution for 21=4j+7+2 equation: 



21=4j+7+2

We move all terms to the left:

21-(4j+7+2)=0

We add all the numbers together, and all the variables

-(4j+9)+21=0

We get rid of parentheses

-4j-9+21=0

We add all the numbers together, and all the variables

-4j+12=0

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

-4j=-12

j=-12/-4

j=+3

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