9r+7=88

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Solution for 9r+7=88 equation: 



9r+7=88

We move all terms to the left:

9r+7-(88)=0

We add all the numbers together, and all the variables

9r-81=0

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

9r=81

r=81/9

r=9

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