9999-7870=x

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Solution for 9999-7870=x equation: 



9999-7870=x

We move all terms to the left:

9999-7870-(x)=0

We add all the numbers together, and all the variables

-1x+2129=0

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

-x=-2129

x=-2129/-1

x=+2129

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