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28=-9c+3c
We move all terms to the left:
28-(-9c+3c)=0
We add all the numbers together, and all the variables
-(-6c)+28=0
We get rid of parentheses
6c+28=0
We move all terms containing c to the left, all other terms to the right
6c=-28
c=-28/6
c=-4+2/3
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