(-20)+(-20)+(-20)=x

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Solution for (-20)+(-20)+(-20)=x equation: 



(-20)+(-20)+(-20)=x

We move all terms to the left:

(-20)+(-20)+(-20)-(x)=0

We add all the numbers together, and all the variables

-1x-60=0

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

-x=60

x=60/-1

x=-60

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