r+7r=12+5r

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Solution for r+7r=12+5r equation: 



r+7r=12+5r

We move all terms to the left:

r+7r-(12+5r)=0

We add all the numbers together, and all the variables

r+7r-(5r+12)=0

We add all the numbers together, and all the variables

8r-(5r+12)=0

We get rid of parentheses

8r-5r-12=0

We add all the numbers together, and all the variables

3r-12=0

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

3r=12

r=12/3

r=4

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