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5.5(2c+7)=80
We move all terms to the left:
5.5(2c+7)-(80)=0
We multiply parentheses
11c+38.5-80=0
We add all the numbers together, and all the variables
11c-41.5=0
We move all terms containing c to the left, all other terms to the right
11c=41.5
c=41.5/11
c=3+5.6666666666667/7.3333333333333
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