3r+7=13+7r

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Solution for 3r+7=13+7r equation: 



3r+7=13+7r

We move all terms to the left:

3r+7-(13+7r)=0

We add all the numbers together, and all the variables

3r-(7r+13)+7=0

We get rid of parentheses

3r-7r-13+7=0

We add all the numbers together, and all the variables

-4r-6=0

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

-4r=6

r=6/-4

r=-1+1/2

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