78=-9x-3(-56+12)

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Solution for 78=-9x-3(-56+12) equation: 



78=-9x-3(-56+12)

We move all terms to the left:

78-(-9x-3(-56+12))=0

We add all the numbers together, and all the variables

-(-9x-3(-44))+78=0



We calculate terms in parentheses: -(-9x-3(-44)), so:

-9x-3(-44)

We add all the numbers together, and all the variables

-9x+132

Back to the equation:

-(-9x+132)



We get rid of parentheses

9x-132+78=0

We add all the numbers together, and all the variables

9x-54=0

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

9x=54

x=54/9

x=6

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