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4c-19=5c-30
We move all terms to the left:
4c-19-(5c-30)=0
We get rid of parentheses
4c-5c+30-19=0
We add all the numbers together, and all the variables
-1c+11=0
We move all terms containing c to the left, all other terms to the right
-c=-11
c=-11/-1
c=+11
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