3*x=300-x

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Solution for 3*x=300-x equation: 



3x=300-x

We move all terms to the left:

3x-(300-x)=0

We add all the numbers together, and all the variables

3x-(-1x+300)=0

We get rid of parentheses

3x+1x-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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