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1(3.1+2)=r
We move all terms to the left:
1(3.1+2)-(r)=0
We add all the numbers together, and all the variables
-r+1(5.1)=0
We add all the numbers together, and all the variables
-1r+5.1=0
We move all terms containing r to the left, all other terms to the right
-r=-5.1
r=-5.1/-1
r=5+0.1/1
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