2x+(x+400)=1000

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Solution for 2x+(x+400)=1000 equation: 



2x+(x+400)=1000

We move all terms to the left:

2x+(x+400)-(1000)=0

We get rid of parentheses

2x+x+400-1000=0

We add all the numbers together, and all the variables

3x-600=0

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

3x=600

x=600/3

x=200

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