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-0.7+r/6.5=-3.1
We move all terms to the left:
-0.7+r/6.5-(-3.1)=0
We add all the numbers together, and all the variables
r/6.5+2.4=0
We multiply all the terms by the denominator
r+(2.4)*6.5=0
We add all the numbers together, and all the variables
r+15.6=0
We move all terms containing r to the left, all other terms to the right
r=-15.6
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