78=c+21

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Solution for 78=c+21 equation: 



78=c+21

We move all terms to the left:

78-(c+21)=0

We get rid of parentheses

-c-21+78=0

We add all the numbers together, and all the variables

-1c+57=0

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

-c=-57

c=-57/-1

c=+57

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