54=x+(x+12)

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Solution for 54=x+(x+12) equation: 



54=x+(x+12)

We move all terms to the left:

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



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

x+(x+12)

We get rid of parentheses

x+x+12

We add all the numbers together, and all the variables

2x+12

Back to the equation:

-(2x+12)



We get rid of parentheses

-2x-12+54=0

We add all the numbers together, and all the variables

-2x+42=0

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

-2x=-42

x=-42/-2

x=+21

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