5r+15=2r+12

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Solution for 5r+15=2r+12 equation: 



5r+15=2r+12

We move all terms to the left:

5r+15-(2r+12)=0

We get rid of parentheses

5r-2r-12+15=0

We add all the numbers together, and all the variables

3r+3=0

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

3r=-3

r=-3/3

r=-1

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