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250+15c=300+10c
We move all terms to the left:
250+15c-(300+10c)=0
We add all the numbers together, and all the variables
15c-(10c+300)+250=0
We get rid of parentheses
15c-10c-300+250=0
We add all the numbers together, and all the variables
5c-50=0
We move all terms containing c to the left, all other terms to the right
5c=50
c=50/5
c=10
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