1+2r=7-r

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Solution for 1+2r=7-r equation: 



1+2r=7-r

We move all terms to the left:

1+2r-(7-r)=0

We add all the numbers together, and all the variables

2r-(-1r+7)+1=0

We get rid of parentheses

2r+1r-7+1=0

We add all the numbers together, and all the variables

3r-6=0

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

3r=6

r=6/3

r=2

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