8r+7r-5r=100

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Solution for 8r+7r-5r=100 equation: 



8r+7r-5r=100

We move all terms to the left:

8r+7r-5r-(100)=0

We add all the numbers together, and all the variables

10r-100=0

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

10r=100

r=100/10

r=10

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