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787.90(6+7)=56r
We move all terms to the left:
787.90(6+7)-(56r)=0
We add all the numbers together, and all the variables
-56r+787.9013=0
We move all terms containing r to the left, all other terms to the right
-56r=-787.9013
r=-787.9013/-56
r=14+2.051911849787/29.453531794036
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