3x=200-x

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Solution for 3x=200-x equation: 



3x=200-x

We move all terms to the left:

3x-(200-x)=0

We add all the numbers together, and all the variables

3x-(-1x+200)=0

We get rid of parentheses

3x+1x-200=0

We add all the numbers together, and all the variables

4x-200=0

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

4x=200

x=200/4

x=50

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