2r-7=20-7r

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Solution for 2r-7=20-7r equation: 



2r-7=20-7r

We move all terms to the left:

2r-7-(20-7r)=0

We add all the numbers together, and all the variables

2r-(-7r+20)-7=0

We get rid of parentheses

2r+7r-20-7=0

We add all the numbers together, and all the variables

9r-27=0

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

9r=27

r=27/9

r=3

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