X+x+x+400=1900

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Solution for X+x+x+400=1900 equation: 



X+X+X+400=1900

We move all terms to the left:

X+X+X+400-(1900)=0

We add all the numbers together, and all the variables

3X-1500=0

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

3X=1500

X=1500/3

X=500

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