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-14.6r+5.7=-78.9
We move all terms to the left:
-14.6r+5.7-(-78.9)=0
We add all the numbers together, and all the variables
-14.6r+84.6=0
We move all terms containing r to the left, all other terms to the right
-14.6r=-84.6
r=-84.6/-14.6
r=5+7.25/9.125
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