7r+10=66-r

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Solution for 7r+10=66-r equation: 



7r+10=66-r

We move all terms to the left:

7r+10-(66-r)=0

We add all the numbers together, and all the variables

7r-(-1r+66)+10=0

We get rid of parentheses

7r+1r-66+10=0

We add all the numbers together, and all the variables

8r-56=0

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

8r=56

r=56/8

r=7

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