-11=1+8r+4r

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Solution for -11=1+8r+4r equation: 



-11=1+8r+4r

We move all terms to the left:

-11-(1+8r+4r)=0

We add all the numbers together, and all the variables

-(12r+1)-11=0

We get rid of parentheses

-12r-1-11=0

We add all the numbers together, and all the variables

-12r-12=0

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

-12r=12

r=12/-12

r=-1

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