8r+13=85

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Solution for 8r+13=85 equation: 



8r+13=85

We move all terms to the left:

8r+13-(85)=0

We add all the numbers together, and all the variables

8r-72=0

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

8r=72

r=72/8

r=9

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