1000-a=139

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Solution for 1000-a=139 equation: 



1000-a=139

We move all terms to the left:

1000-a-(139)=0

We add all the numbers together, and all the variables

-1a+861=0

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

-a=-861

a=-861/-1

a=+861

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