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r.6.5=-9.3
We move all terms to the left:
r.6.5-(-9.3)=0
We add all the numbers together, and all the variables
r.6.5+9.3=0
We move all terms containing r to the left, all other terms to the right
r.6.5=-9.3
r=-9.3/1
r=-9.3
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