9(8+r)=81

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Solution for 9(8+r)=81 equation: 



9(8+r)=81

We move all terms to the left:

9(8+r)-(81)=0

We add all the numbers together, and all the variables

9(r+8)-81=0

We multiply parentheses

9r+72-81=0

We add all the numbers together, and all the variables

9r-9=0

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

9r=9

r=9/9

r=1

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