2x+x-100=800

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Solution for 2x+x-100=800 equation: 



2x+x-100=800

We move all terms to the left:

2x+x-100-(800)=0

We add all the numbers together, and all the variables

3x-900=0

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

3x=900

x=900/3

x=300

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