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20=-4-6c
We move all terms to the left:
20-(-4-6c)=0
We add all the numbers together, and all the variables
-(-6c-4)+20=0
We get rid of parentheses
6c+4+20=0
We add all the numbers together, and all the variables
6c+24=0
We move all terms containing c to the left, all other terms to the right
6c=-24
c=-24/6
c=-4
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