-r-7=-8

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Solution for -r-7=-8 equation: 



-r-7=-8

We move all terms to the left:

-r-7-(-8)=0

We add all the numbers together, and all the variables

-1r+1=0

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

-r=-1

r=-1/-1

r=1

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