X+10+x+x-20=80

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Solution for X+10+x+x-20=80 equation: 



X+10+X+X-20=80

We move all terms to the left:

X+10+X+X-20-(80)=0

We add all the numbers together, and all the variables

3X-90=0

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

3X=90

X=90/3

X=30

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