3x=400-x

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Solution for 3x=400-x equation: 



3x=400-x

We move all terms to the left:

3x-(400-x)=0

We add all the numbers together, and all the variables

3x-(-1x+400)=0

We get rid of parentheses

3x+1x-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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