81=9(j+1)

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Solution for 81=9(j+1) equation: 



81=9(j+1)

We move all terms to the left:

81-(9(j+1))=0



We calculate terms in parentheses: -(9(j+1)), so:

9(j+1)

We multiply parentheses

9j+9

Back to the equation:

-(9j+9)



We get rid of parentheses

-9j-9+81=0

We add all the numbers together, and all the variables

-9j+72=0

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

-9j=-72

j=-72/-9

j=+8

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