r-8r=72

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Solution for r-8r=72 equation: 



r-8r=72

We move all terms to the left:

r-8r-(72)=0

We add all the numbers together, and all the variables

-7r-72=0

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

-7r=72

r=72/-7

r=-10+2/7

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