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50=10+8r
We move all terms to the left:
50-(10+8r)=0
We add all the numbers together, and all the variables
-(8r+10)+50=0
We get rid of parentheses
-8r-10+50=0
We add all the numbers together, and all the variables
-8r+40=0
We move all terms containing r to the left, all other terms to the right
-8r=-40
r=-40/-8
r=+5
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