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81=72(1+r)
We move all terms to the left:
81-(72(1+r))=0
We add all the numbers together, and all the variables
-(72(r+1))+81=0
We calculate terms in parentheses: -(72(r+1)), so:We get rid of parentheses
72(r+1)
We multiply parentheses
72r+72
Back to the equation:
-(72r+72)
-72r-72+81=0
We add all the numbers together, and all the variables
-72r+9=0
We move all terms containing r to the left, all other terms to the right
-72r=-9
r=-9/-72
r=1/8
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