-7x-12=-7x-+3(-4-x)

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Solution for -7x-12=-7x-+3(-4-x) equation: 



-7x-12=-7x-+3(-4-x)

We move all terms to the left:

-7x-12-(-7x-+3(-4-x))=0

We add all the numbers together, and all the variables

-7x-(-7x-+3(-1x-4))-12=0

We use the square of the difference formula

-7x-(-7x-3(-1x-4))-12=0



We calculate terms in parentheses: -(-7x-3(-1x-4)), so:

-7x-3(-1x-4)

We multiply parentheses

-7x+3x+12

We add all the numbers together, and all the variables

-4x+12

Back to the equation:

-(-4x+12)



We get rid of parentheses

-7x+4x-12-12=0

We add all the numbers together, and all the variables

-3x-24=0

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

-3x=24

x=24/-3

x=-8

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