12+x=-3(4+x)

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



12+x=-3(4+x)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

-3(x+4)

We multiply parentheses

-3x-12

Back to the equation:

-(-3x-12)



We get rid of parentheses

x+3x+12+12=0

We add all the numbers together, and all the variables

4x+24=0

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

4x=-24

x=-24/4

x=-6

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