3x+6x-12=42

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Solution for 3x+6x-12=42 equation: 



3x+6x-12=42

We move all terms to the left:

3x+6x-12-(42)=0

We add all the numbers together, and all the variables

9x-54=0

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

9x=54

x=54/9

x=6

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