-3=1-r-7

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



-3=1-r-7

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(-1r-6)-3=0

We get rid of parentheses

1r+6-3=0

We add all the numbers together, and all the variables

r+3=0

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

r=-3

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