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10=5.r
We move all terms to the left:
10-(5.r)=0
We add all the numbers together, and all the variables
-(+5.r)+10=0
We get rid of parentheses
-5.r+10=0
We add all the numbers together, and all the variables
-5r+10=0
We move all terms containing r to the left, all other terms to the right
-5r=-10
r=-10/-5
r=+2
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