7-c=-21

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Solution for 7-c=-21 equation: 



7-c=-21

We move all terms to the left:

7-c-(-21)=0

We add all the numbers together, and all the variables

-1c+28=0

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

-c=-28

c=-28/-1

c=+28

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