3r+7=19-r

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Solution for 3r+7=19-r equation: 



3r+7=19-r

We move all terms to the left:

3r+7-(19-r)=0

We add all the numbers together, and all the variables

3r-(-1r+19)+7=0

We get rid of parentheses

3r+1r-19+7=0

We add all the numbers together, and all the variables

4r-12=0

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

4r=12

r=12/4

r=3

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