-7=1+2r

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Solution for -7=1+2r equation: 



-7=1+2r

We move all terms to the left:

-7-(1+2r)=0

We add all the numbers together, and all the variables

-(2r+1)-7=0

We get rid of parentheses

-2r-1-7=0

We add all the numbers together, and all the variables

-2r-8=0

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

-2r=8

r=8/-2

r=-4

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