(-2)+(-7)=x

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Solution for (-2)+(-7)=x equation: 



(-2)+(-7)=x

We move all terms to the left:

(-2)+(-7)-(x)=0

We add all the numbers together, and all the variables

-1x-9=0

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

-x=9

x=9/-1

x=-9

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