Answer:
134
Explanation
x plus 2x= 402
2x plus x +3x so then it would be
3x = 402
then divide 3x and 402 by 3
you will then get
x = 134
to check your answer you can do 134 plus 268 and that equals 402.
you would add 134 to 268 because 268 is double 134.
Hopefully that helped.