15-r=-7r+3

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



15-r=-7r+3

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

6r+12=0

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

6r=-12

r=-12/6

r=-2

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