x+x+x+x+x=400+x

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Solution for x+x+x+x+x=400+x equation: 



x+x+x+x+x=400+x

We move all terms to the left:

x+x+x+x+x-(400+x)=0

We add all the numbers together, and all the variables

x+x+x+x+x-(x+400)=0

We add all the numbers together, and all the variables

5x-(x+400)=0

We get rid of parentheses

5x-x-400=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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