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700=7c+84+15c
We move all terms to the left:
700-(7c+84+15c)=0
We add all the numbers together, and all the variables
-(22c+84)+700=0
We get rid of parentheses
-22c-84+700=0
We add all the numbers together, and all the variables
-22c+616=0
We move all terms containing c to the left, all other terms to the right
-22c=-616
c=-616/-22
c=+28
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