72=9(8+r)

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Solution for 72=9(8+r) equation:



72=9(8+r)
We move all terms to the left:
72-(9(8+r))=0
We add all the numbers together, and all the variables
-(9(r+8))+72=0
We calculate terms in parentheses: -(9(r+8)), so:
9(r+8)
We multiply parentheses
9r+72
Back to the equation:
-(9r+72)
We get rid of parentheses
-9r-72+72=0
We add all the numbers together, and all the variables
-9r=0
r=0/-9
r=0

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