8-8r=-1

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Solution for 8-8r=-1 equation: 



8-8r=-1

We move all terms to the left:

8-8r-(-1)=0

We add all the numbers together, and all the variables

-8r+9=0

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

-8r=-9

r=-9/-8

r=1+1/8

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