129=39-x

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Solution for 129=39-x equation: 



129=39-x

We move all terms to the left:

129-(39-x)=0

We add all the numbers together, and all the variables

-(-1x+39)+129=0

We get rid of parentheses

1x-39+129=0

We add all the numbers together, and all the variables

x+90=0

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

x=-90

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