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-643=r+-292
We move all terms to the left:
-643-(r+-292)=0
We add all the numbers together, and all the variables
-(r-292)-643=0
We get rid of parentheses
-r+292-643=0
We add all the numbers together, and all the variables
-1r-351=0
We move all terms containing r to the left, all other terms to the right
-r=351
r=351/-1
r=-351
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