X=300-3x

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Solution for X=300-3x equation: 



X=300-3X

We move all terms to the left:

X-(300-3X)=0

We add all the numbers together, and all the variables

X-(-3X+300)=0

We get rid of parentheses

X+3X-300=0

We add all the numbers together, and all the variables

4X-300=0

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

4X=300

X=300/4

X=75

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