Answer:
4x
Explanation:
everytime the variable is alone it stands for 1 so,
x is the same as 1x it's invisible 1 so no one puts it so,
3x + x is the same as 3x + 1x = 4x.
Ace- The Kid Laroi- Artist-Rapper, songwriter.
you have 3 of x and add another x to get 4 of x
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