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-28=5c+2c
We move all terms to the left:
-28-(5c+2c)=0
We add all the numbers together, and all the variables
-(+7c)-28=0
We get rid of parentheses
-7c-28=0
We move all terms containing c to the left, all other terms to the right
-7c=28
c=28/-7
c=-4
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