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(c+170)+c=670
We move all terms to the left:
(c+170)+c-(670)=0
We add all the numbers together, and all the variables
c+(c+170)-670=0
We get rid of parentheses
c+c+170-670=0
We add all the numbers together, and all the variables
2c-500=0
We move all terms containing c to the left, all other terms to the right
2c=500
c=500/2
c=250
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