21+7c=-7

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Solution for 21+7c=-7 equation: 



21+7c=-7

We move all terms to the left:

21+7c-(-7)=0

We add all the numbers together, and all the variables

7c+28=0

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

7c=-28

c=-28/7

c=-4

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