-15=-1+2r

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Solution for -15=-1+2r equation: 



-15=-1+2r

We move all terms to the left:

-15-(-1+2r)=0

We add all the numbers together, and all the variables

-(2r-1)-15=0

We get rid of parentheses

-2r+1-15=0

We add all the numbers together, and all the variables

-2r-14=0

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

-2r=14

r=14/-2

r=-7

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