DulceMariadelRosario DulceMariadelRosario

23-02-2022
Mathematics

contestada

21x =7?
A. x=3
B. None of these
C. x=147
D. x=28

Relax

Respuesta :

Snor1ax Snor1ax

23-02-2022

Answer: B

Step-by-step explanation:

To isolate x, you divide both sides by 21

21x=7

[tex]\frac{21x}{21}=\frac{7}{21}[/tex]

x = 7/21

Simplify by dividing both the numerator and denominator by 7

x = 1/3

Since, 1/3 is not an option, B is the correct answer

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