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we have the following:
[tex]\begin{gathered} 126=x+2x+3x \\ \end{gathered}[/tex]solving:
[tex]\begin{gathered} 126=6x \\ x=\frac{126}{6} \\ x=21 \end{gathered}[/tex]therefore,
first number is 21
second number is 42 (21*2)
third number is 63 (21*3)