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0=-7+r
We move all terms to the left:
0-(-7+r)=0
We add all the numbers together, and all the variables
-(r-7)+0=0
We add all the numbers together, and all the variables
-(r-7)=0
We get rid of parentheses
-r+7=0
We add all the numbers together, and all the variables
-1r+7=0
We move all terms containing r to the left, all other terms to the right
-r=-7
r=-7/-1
r=+7
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