9=8-r

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Solution for 9=8-r equation:



9=8-r
We move all terms to the left:
9-(8-r)=0
We add all the numbers together, and all the variables
-(-1r+8)+9=0
We get rid of parentheses
1r-8+9=0
We add all the numbers together, and all the variables
r+1=0
We move all terms containing r to the left, all other terms to the right
r=-1

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