81=72(1+r)10

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Solution for 81=72(1+r)10 equation: 



81=72(1+r)10

We move all terms to the left:

81-(72(1+r)10)=0

We add all the numbers together, and all the variables

-(72(r+1)10)+81=0



We calculate terms in parentheses: -(72(r+1)10), so:

72(r+1)10

We multiply parentheses

720r+720

Back to the equation:

-(720r+720)



We get rid of parentheses

-720r-720+81=0

We add all the numbers together, and all the variables

-720r-639=0

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

-720r=639

r=639/-720

r=-71/80

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