-30=12+7c

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Solution for -30=12+7c equation: 



-30=12+7c

We move all terms to the left:

-30-(12+7c)=0

We add all the numbers together, and all the variables

-(7c+12)-30=0

We get rid of parentheses

-7c-12-30=0

We add all the numbers together, and all the variables

-7c-42=0

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

-7c=42

c=42/-7

c=-6

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