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-2(-c+9)+12=4
We move all terms to the left:
-2(-c+9)+12-(4)=0
We add all the numbers together, and all the variables
-2(-1c+9)+12-4=0
We add all the numbers together, and all the variables
-2(-1c+9)+8=0
We multiply parentheses
2c-18+8=0
We add all the numbers together, and all the variables
2c-10=0
We move all terms containing c to the left, all other terms to the right
2c=10
c=10/2
c=5
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