3x=x+400

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Solution for 3x=x+400 equation: 



3x=x+400

We move all terms to the left:

3x-(x+400)=0

We get rid of parentheses

3x-x-400=0

We add all the numbers together, and all the variables

2x-400=0

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

2x=400

x=400/2

x=200

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