75=21+6c

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Solution for 75=21+6c equation: 



75=21+6c

We move all terms to the left:

75-(21+6c)=0

We add all the numbers together, and all the variables

-(6c+21)+75=0

We get rid of parentheses

-6c-21+75=0

We add all the numbers together, and all the variables

-6c+54=0

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

-6c=-54

c=-54/-6

c=+9

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