x+(x+15)+3x=405

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Solution for x+(x+15)+3x=405 equation: 



x+(x+15)+3x=405

We move all terms to the left:

x+(x+15)+3x-(405)=0

We add all the numbers together, and all the variables

4x+(x+15)-405=0

We get rid of parentheses

4x+x+15-405=0

We add all the numbers together, and all the variables

5x-390=0

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

5x=390

x=390/5

x=78

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