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400+100c=500+70c
We move all terms to the left:
400+100c-(500+70c)=0
We add all the numbers together, and all the variables
100c-(70c+500)+400=0
We get rid of parentheses
100c-70c-500+400=0
We add all the numbers together, and all the variables
30c-100=0
We move all terms containing c to the left, all other terms to the right
30c=100
c=100/30
c=3+1/3
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