1+2+3+4+5=x+x+3x

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Solution for 1+2+3+4+5=x+x+3x equation: 



1+2+3+4+5=x+x+3x

We move all terms to the left:

1+2+3+4+5-(x+x+3x)=0

We add all the numbers together, and all the variables

-(+5x)+1+2+3+4+5=0

We add all the numbers together, and all the variables

-(+5x)+15=0

We get rid of parentheses

-5x+15=0

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

-5x=-15

x=-15/-5

x=+3

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