78=-7x-4(5x+21)

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Solution for 78=-7x-4(5x+21) equation: 



78=-7x-4(5x+21)

We move all terms to the left:

78-(-7x-4(5x+21))=0



We calculate terms in parentheses: -(-7x-4(5x+21)), so:

-7x-4(5x+21)

We multiply parentheses

-7x-20x-84

We add all the numbers together, and all the variables

-27x-84

Back to the equation:

-(-27x-84)



We get rid of parentheses

27x+84+78=0

We add all the numbers together, and all the variables

27x+162=0

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

27x=-162

x=-162/27

x=-6

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