3r-1=7+r

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Solution for 3r-1=7+r equation: 



3r-1=7+r

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3r-r-7-1=0

We add all the numbers together, and all the variables

2r-8=0

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

2r=8

r=8/2

r=4

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