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(12-c)4=-28
We move all terms to the left:
(12-c)4-(-28)=0
We add all the numbers together, and all the variables
(-1c+12)4-(-28)=0
We add all the numbers together, and all the variables
(-1c+12)4+28=0
We multiply parentheses
-4c+48+28=0
We add all the numbers together, and all the variables
-4c+76=0
We move all terms containing c to the left, all other terms to the right
-4c=-76
c=-76/-4
c=+19
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