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50=-10+r
We move all terms to the left:
50-(-10+r)=0
We add all the numbers together, and all the variables
-(r-10)+50=0
We get rid of parentheses
-r+10+50=0
We add all the numbers together, and all the variables
-1r+60=0
We move all terms containing r to the left, all other terms to the right
-r=-60
r=-60/-1
r=+60
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