400+4x=800

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Solution for 400+4x=800 equation: 



400+4x=800

We move all terms to the left:

400+4x-(800)=0

We add all the numbers together, and all the variables

4x-400=0

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

4x=400

x=400/4

x=100

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