405=x+2x+3x

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Solution for 405=x+2x+3x equation: 



405=x+2x+3x

We move all terms to the left:

405-(x+2x+3x)=0

We add all the numbers together, and all the variables

-(+6x)+405=0

We get rid of parentheses

-6x+405=0

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

-6x=-405

x=-405/-6

x=67+1/2

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