(x+2x)+4x=405

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Solution for (x+2x)+4x=405 equation: 



(x+2x)+4x=405

We move all terms to the left:

(x+2x)+4x-(405)=0

We add all the numbers together, and all the variables

(+3x)+4x-405=0

We add all the numbers together, and all the variables

4x+(+3x)-405=0

We get rid of parentheses

4x+3x-405=0

We add all the numbers together, and all the variables

7x-405=0

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

7x=405

x=405/7

x=57+6/7

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