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(c+15)+405=100+(15+405)
We move all terms to the left:
(c+15)+405-(100+(15+405))=0
We add all the numbers together, and all the variables
(c+15)+405-(100+420)=0
We add all the numbers together, and all the variables
(c+15)-115=0
We get rid of parentheses
c+15-115=0
We add all the numbers together, and all the variables
c-100=0
We move all terms containing c to the left, all other terms to the right
c=100
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