3(7-7c)=-6(9-9c)

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Solution for 3(7-7c)=-6(9-9c) equation: 



3(7-7c)=-6(9-9c)

We move all terms to the left:

3(7-7c)-(-6(9-9c))=0

We add all the numbers together, and all the variables

3(-7c+7)-(-6(-9c+9))=0

We multiply parentheses

-21c-(-6(-9c+9))+21=0



We calculate terms in parentheses: -(-6(-9c+9)), so:

-6(-9c+9)

We multiply parentheses

54c-54

Back to the equation:

-(54c-54)



We get rid of parentheses

-21c-54c+54+21=0

We add all the numbers together, and all the variables

-75c+75=0

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

-75c=-75

c=-75/-75

c=1

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