420=-12c+7(-1-7c)

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Solution for 420=-12c+7(-1-7c) equation: 



420=-12c+7(-1-7c)

We move all terms to the left:

420-(-12c+7(-1-7c))=0

We add all the numbers together, and all the variables

-(-12c+7(-7c-1))+420=0



We calculate terms in parentheses: -(-12c+7(-7c-1)), so:

-12c+7(-7c-1)

We multiply parentheses

-12c-49c-7

We add all the numbers together, and all the variables

-61c-7

Back to the equation:

-(-61c-7)



We get rid of parentheses

61c+7+420=0

We add all the numbers together, and all the variables

61c+427=0

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

61c=-427

c=-427/61

c=-7

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