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-1=-5+r
We move all terms to the left:
-1-(-5+r)=0
We add all the numbers together, and all the variables
-(r-5)-1=0
We get rid of parentheses
-r+5-1=0
We add all the numbers together, and all the variables
-1r+4=0
We move all terms containing r to the left, all other terms to the right
-r=-4
r=-4/-1
r=+4
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