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259=75+r.r
We move all terms to the left:
259-(75+r.r)=0
We add all the numbers together, and all the variables
-(r.r+75)+259=0
We get rid of parentheses
-r.r-75+259=0
We add all the numbers together, and all the variables
-r.r+184=0
We move all terms containing r to the left, all other terms to the right
-r.r=-184
r=-184/1
r=-184
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