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4c-10=2c-20
We move all terms to the left:
4c-10-(2c-20)=0
We get rid of parentheses
4c-2c+20-10=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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