x-20=90-30=x

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Solution for x-20=90-30=x equation: 



X-20=90-30=X

We move all terms to the left:

X-20-(90-30)=0

We add all the numbers together, and all the variables

X-20-60=0

We add all the numbers together, and all the variables

X-80=0

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

X=80

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