7c+21-3c=-(c+4)

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Solution for 7c+21-3c=-(c+4) equation: 



7c+21-3c=-(c+4)

We move all terms to the left:

7c+21-3c-(-(c+4))=0

We add all the numbers together, and all the variables

4c-(-(c+4))+21=0



We calculate terms in parentheses: -(-(c+4)), so:

-(c+4)

We get rid of parentheses

-c-4

We add all the numbers together, and all the variables

-1c-4

Back to the equation:

-(-1c-4)



We get rid of parentheses

4c+1c+4+21=0

We add all the numbers together, and all the variables

5c+25=0

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

5c=-25

c=-25/5

c=-5

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