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4(c+-7)+12=20
We move all terms to the left:
4(c+-7)+12-(20)=0
We add all the numbers together, and all the variables
4(c-7)+12-20=0
We add all the numbers together, and all the variables
4(c-7)-8=0
We multiply parentheses
4c-28-8=0
We add all the numbers together, and all the variables
4c-36=0
We move all terms containing c to the left, all other terms to the right
4c=36
c=36/4
c=9
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