1r+15=3r+7

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Solution for 1r+15=3r+7 equation: 



1r+15=3r+7

We move all terms to the left:

1r+15-(3r+7)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

r-3r-7+15=0

We add all the numbers together, and all the variables

-2r+8=0

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

-2r=-8

r=-8/-2

r=+4

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