X=12-(30+x)

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Solution for X=12-(30+x) equation: 



X=12-(30+X)

We move all terms to the left:

X-(12-(30+X))=0

We add all the numbers together, and all the variables

X-(12-(X+30))=0



We calculate terms in parentheses: -(12-(X+30)), so:

12-(X+30)

determiningTheFunctionDomain
-(X+30)+12

We get rid of parentheses

-X-30+12

We add all the numbers together, and all the variables

-1X-18

Back to the equation:

-(-1X-18)



We get rid of parentheses

X+1X+18=0

We add all the numbers together, and all the variables

2X+18=0

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

2X=-18

X=-18/2

X=-9

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