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10-c=4c-20
We move all terms to the left:
10-c-(4c-20)=0
We add all the numbers together, and all the variables
-1c-(4c-20)+10=0
We get rid of parentheses
-1c-4c+20+10=0
We add all the numbers together, and all the variables
-5c+30=0
We move all terms containing c to the left, all other terms to the right
-5c=-30
c=-30/-5
c=+6
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