3r+7r=10

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Solution for 3r+7r=10 equation: 



3r+7r=10

We move all terms to the left:

3r+7r-(10)=0

We add all the numbers together, and all the variables

10r-10=0

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

10r=10

r=10/10

r=1

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