x=78-x

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Solution for x=78-x equation: 



x=78-x

We move all terms to the left:

x-(78-x)=0

We add all the numbers together, and all the variables

x-(-1x+78)=0

We get rid of parentheses

x+1x-78=0

We add all the numbers together, and all the variables

2x-78=0

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

2x=78

x=78/2

x=39

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