-78=-6x-2(2x-21)

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Solution for -78=-6x-2(2x-21) equation: 



-78=-6x-2(2x-21)

We move all terms to the left:

-78-(-6x-2(2x-21))=0



We calculate terms in parentheses: -(-6x-2(2x-21)), so:

-6x-2(2x-21)

We multiply parentheses

-6x-4x+42

We add all the numbers together, and all the variables

-10x+42

Back to the equation:

-(-10x+42)



We get rid of parentheses

10x-42-78=0

We add all the numbers together, and all the variables

10x-120=0

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

10x=120

x=120/10

x=12

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