1200=x+3x

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Solution for 1200=x+3x equation: 



1200=x+3x

We move all terms to the left:

1200-(x+3x)=0

We add all the numbers together, and all the variables

-(+4x)+1200=0

We get rid of parentheses

-4x+1200=0

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

-4x=-1200

x=-1200/-4

x=+300

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