-129=5x+3(-4x-15)

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Solution for -129=5x+3(-4x-15) equation: 



-129=5x+3(-4x-15)

We move all terms to the left:

-129-(5x+3(-4x-15))=0



We calculate terms in parentheses: -(5x+3(-4x-15)), so:

5x+3(-4x-15)

We multiply parentheses

5x-12x-45

We add all the numbers together, and all the variables

-7x-45

Back to the equation:

-(-7x-45)



We get rid of parentheses

7x+45-129=0

We add all the numbers together, and all the variables

7x-84=0

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

7x=84

x=84/7

x=12

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