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35.9=-7.8c+43.7
We move all terms to the left:
35.9-(-7.8c+43.7)=0
We get rid of parentheses
7.8c-43.7+35.9=0
We add all the numbers together, and all the variables
7.8c-7.8=0
We move all terms containing c to the left, all other terms to the right
7.8c=7.8
c=7.8/7.8
c=1
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