(39+x)-84=78

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Solution for (39+x)-84=78 equation: 



(39+x)-84=78

We move all terms to the left:

(39+x)-84-(78)=0

We add all the numbers together, and all the variables

(x+39)-84-78=0

We add all the numbers together, and all the variables

(x+39)-162=0

We get rid of parentheses

x+39-162=0

We add all the numbers together, and all the variables

x-123=0

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

x=123

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