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(-3+1)^2+(3+-5)^2=r
We move all terms to the left:
(-3+1)^2+(3+-5)^2-(r)=0
We add all the numbers together, and all the variables
-r+(-2)^2+(-2)^2=0
We add all the numbers together, and all the variables
-1r+8=0
We move all terms containing r to the left, all other terms to the right
-r=-8
r=-8/-1
r=+8
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