1+7r=3r-15

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



1+7r=3r-15

We move all terms to the left:

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

We get rid of parentheses

7r-3r+15+1=0

We add all the numbers together, and all the variables

4r+16=0

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

4r=-16

r=-16/4

r=-4

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