100x+200=300x+400

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Solution for 100x+200=300x+400 equation: 



100x+200=300x+400

We move all terms to the left:

100x+200-(300x+400)=0

We get rid of parentheses

100x-300x-400+200=0

We add all the numbers together, and all the variables

-200x-200=0

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

-200x=200

x=200/-200

x=-1

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