99=6x+3(-6x-15)

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Solution for 99=6x+3(-6x-15) equation: 



99=6x+3(-6x-15)

We move all terms to the left:

99-(6x+3(-6x-15))=0



We calculate terms in parentheses: -(6x+3(-6x-15)), so:

6x+3(-6x-15)

We multiply parentheses

6x-18x-45

We add all the numbers together, and all the variables

-12x-45

Back to the equation:

-(-12x-45)



We get rid of parentheses

12x+45+99=0

We add all the numbers together, and all the variables

12x+144=0

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

12x=-144

x=-144/12

x=-12

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