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2(c-12)=-20
We move all terms to the left:
2(c-12)-(-20)=0
We add all the numbers together, and all the variables
2(c-12)+20=0
We multiply parentheses
2c-24+20=0
We add all the numbers together, and all the variables
2c-4=0
We move all terms containing c to the left, all other terms to the right
2c=4
c=4/2
c=2
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