5r+7=55-r

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Solution for 5r+7=55-r equation: 



5r+7=55-r

We move all terms to the left:

5r+7-(55-r)=0

We add all the numbers together, and all the variables

5r-(-1r+55)+7=0

We get rid of parentheses

5r+1r-55+7=0

We add all the numbers together, and all the variables

6r-48=0

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

6r=48

r=48/6

r=8

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