Respuesta :

MotherRhea
To find the number you would start by writing out the equation using x as the number. The equation would be x+2x=21. The first step to solve this equation would be to combine like terms, making the equation 3x=21. Finally, you would divide both sides by three, making your answer x=7.
122317
2x + x = 21. Combine your like terms and you get3x = 21. Divide both by sides 3 and you get x = 21.

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