1-(-2r)=7

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Solution for 1-(-2r)=7 equation: 



1-(-2r)=7

We move all terms to the left:

1-(-2r)-(7)=0

We add all the numbers together, and all the variables

-(-2r)-6=0

We get rid of parentheses

2r-6=0

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

2r=6

r=6/2

r=3

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