x=300-2x

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Solution for x=300-2x equation: 



x=300-2x

We move all terms to the left:

x-(300-2x)=0

We add all the numbers together, and all the variables

x-(-2x+300)=0

We get rid of parentheses

x+2x-300=0

We add all the numbers together, and all the variables

3x-300=0

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

3x=300

x=300/3

x=100

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