31=10j-9

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Solution for 31=10j-9 equation: 



31=10j-9

We move all terms to the left:

31-(10j-9)=0

We get rid of parentheses

-10j+9+31=0

We add all the numbers together, and all the variables

-10j+40=0

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

-10j=-40

j=-40/-10

j=+4

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