400x+1200=4000

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Solution for 400x+1200=4000 equation: 



400x+1200=4000

We move all terms to the left:

400x+1200-(4000)=0

We add all the numbers together, and all the variables

400x-2800=0

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

400x=2800

x=2800/400

x=7

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