3+x+3+x=42

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



3+x+3+x=42

We move all terms to the left:

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

We add all the numbers together, and all the variables

2x-36=0

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

2x=36

x=36/2

x=18

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