18c-10c+7c+7c-21=1

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Solution for 18c-10c+7c+7c-21=1 equation: 



18c-10c+7c+7c-21=1

We move all terms to the left:

18c-10c+7c+7c-21-(1)=0

We add all the numbers together, and all the variables

22c-22=0

We move all terms containing c to the left, all other terms to the right

22c=22

c=22/22

c=1

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