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3(c-4)=(-9)=21
We move all terms to the left:
3(c-4)-((-9))=0
We add all the numbers together, and all the variables
3(c-4)+9=0
We multiply parentheses
3c-12+9=0
We add all the numbers together, and all the variables
3c-3=0
We move all terms containing c to the left, all other terms to the right
3c=3
c=3/3
c=1
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