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28=-1c+16-21c-9
We move all terms to the left:
28-(-1c+16-21c-9)=0
We add all the numbers together, and all the variables
-(-22c+7)+28=0
We get rid of parentheses
22c-7+28=0
We add all the numbers together, and all the variables
22c+21=0
We move all terms containing c to the left, all other terms to the right
22c=-21
c=-21/22
c=-21/22
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