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-7(c+4)=7
We move all terms to the left:
-7(c+4)-(7)=0
We multiply parentheses
-7c-28-7=0
We add all the numbers together, and all the variables
-7c-35=0
We move all terms containing c to the left, all other terms to the right
-7c=35
c=35/-7
c=-5
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