8=-3c+21

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Solution for 8=-3c+21 equation: 



8=-3c+21

We move all terms to the left:

8-(-3c+21)=0

We get rid of parentheses

3c-21+8=0

We add all the numbers together, and all the variables

3c-13=0

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

3c=13

c=13/3

c=4+1/3

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