3x+6x+3x=42

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Solution for 3x+6x+3x=42 equation: 



3x+6x+3x=42

We move all terms to the left:

3x+6x+3x-(42)=0

We add all the numbers together, and all the variables

12x-42=0

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

12x=42

x=42/12

x=3+1/2

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