3.9=j-4

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Solution for 3.9=j-4 equation: 



3.9=j-4

We move all terms to the left:

3.9-(j-4)=0

We get rid of parentheses

-j+4+3.9=0

We add all the numbers together, and all the variables

-1j+7.9=0

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

-j=-7.9

j=-7.9/-1

j=7+0.9/1

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