x+3x+2x=18-x

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Solution for x+3x+2x=18-x equation: 



x+3x+2x=18-x

We move all terms to the left:

x+3x+2x-(18-x)=0

We add all the numbers together, and all the variables

x+3x+2x-(-1x+18)=0

We add all the numbers together, and all the variables

6x-(-1x+18)=0

We get rid of parentheses

6x+1x-18=0

We add all the numbers together, and all the variables

7x-18=0

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

7x=18

x=18/7

x=2+4/7

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