400+20x=1200

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Solution for 400+20x=1200 equation: 



400+20x=1200

We move all terms to the left:

400+20x-(1200)=0

We add all the numbers together, and all the variables

20x-800=0

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

20x=800

x=800/20

x=40

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