39=54-x

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Solution for 39=54-x equation: 



39=54-x

We move all terms to the left:

39-(54-x)=0

We add all the numbers together, and all the variables

-(-1x+54)+39=0

We get rid of parentheses

1x-54+39=0

We add all the numbers together, and all the variables

x-15=0

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

x=15

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