(-15)+(-6)=x

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Solution for (-15)+(-6)=x equation: 



(-15)+(-6)=x

We move all terms to the left:

(-15)+(-6)-(x)=0

We add all the numbers together, and all the variables

-1x-21=0

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

-x=21

x=21/-1

x=-21

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