x+21=12-(-x)

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Solution for x+21=12-(-x) equation: 



x+21=12-(-x)

We move all terms to the left:

x+21-(12-(-x))=0

We add all the numbers together, and all the variables

x-(12-(-1x))+21=0



We calculate terms in parentheses: -(12-(-1x)), so:

12-(-1x)

determiningTheFunctionDomain
-(-1x)+12

We get rid of parentheses

1x+12

We add all the numbers together, and all the variables

x+12

Back to the equation:

-(x+12)



We get rid of parentheses

x-x-12+21=0

We add all the numbers together, and all the variables

9!=0

There is no solution for this equation

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