7r+15=3r+35

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Solution for 7r+15=3r+35 equation: 



7r+15=3r+35

We move all terms to the left:

7r+15-(3r+35)=0

We get rid of parentheses

7r-3r-35+15=0

We add all the numbers together, and all the variables

4r-20=0

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

4r=20

r=20/4

r=5

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