2r+3=12-r

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Solution for 2r+3=12-r equation: 



2r+3=12-r

We move all terms to the left:

2r+3-(12-r)=0

We add all the numbers together, and all the variables

2r-(-1r+12)+3=0

We get rid of parentheses

2r+1r-12+3=0

We add all the numbers together, and all the variables

3r-9=0

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

3r=9

r=9/3

r=3

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