x+2x+3x+4x=400

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Solution for x+2x+3x+4x=400 equation: 



x+2x+3x+4x=400

We move all terms to the left:

x+2x+3x+4x-(400)=0

We add all the numbers together, and all the variables

10x-400=0

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

10x=400

x=400/10

x=40

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