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20+0.15c=30+0.10c
We move all terms to the left:
20+0.15c-(30+0.10c)=0
We add all the numbers together, and all the variables
0.15c-(0.10c+30)+20=0
We get rid of parentheses
0.15c-0.10c-30+20=0
We add all the numbers together, and all the variables
0.05c-10=0
We move all terms containing c to the left, all other terms to the right
0.05c=10
c=10/0.05
c=200
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