7r+1=3r+13

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Solution for 7r+1=3r+13 equation: 



7r+1=3r+13

We move all terms to the left:

7r+1-(3r+13)=0

We get rid of parentheses

7r-3r-13+1=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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