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3=7-c
We move all terms to the left:
3-(7-c)=0
We add all the numbers together, and all the variables
-(-1c+7)+3=0
We get rid of parentheses
1c-7+3=0
We add all the numbers together, and all the variables
c-4=0
We move all terms containing c to the left, all other terms to the right
c=4
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