3x+x+2x=42

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Solution for 3x+x+2x=42 equation: 



3x+x+2x=42

We move all terms to the left:

3x+x+2x-(42)=0

We add all the numbers together, and all the variables

6x-42=0

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

6x=42

x=42/6

x=7

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