x-3x=400

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Solution for x-3x=400 equation: 



x-3x=400

We move all terms to the left:

x-3x-(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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