x+2x+3x=18+12+6

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Solution for x+2x+3x=18+12+6 equation: 



x+2x+3x=18+12+6

We move all terms to the left:

x+2x+3x-(18+12+6)=0

We add all the numbers together, and all the variables

x+2x+3x-36=0

We add all the numbers together, and all the variables

6x-36=0

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

6x=36

x=36/6

x=6

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