81=9(j-4)

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Solution for 81=9(j-4) equation:



81=9(j-4)
We move all terms to the left:
81-(9(j-4))=0
We calculate terms in parentheses: -(9(j-4)), so:
9(j-4)
We multiply parentheses
9j-36
Back to the equation:
-(9j-36)
We get rid of parentheses
-9j+36+81=0
We add all the numbers together, and all the variables
-9j+117=0
We move all terms containing j to the left, all other terms to the right
-9j=-117
j=-117/-9
j=+13

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