Respuesta :

milkdudgirl145

Answer:

x = 10

Have a good day! Brainliest?

Luinta12

Answer:

x= 10

Step-by-step explanation:

4x- 1x= 3x

3x- 9 = 21

3x- 9 (+9)= 21 (+9)

3x= 30

3x (÷3)= 30 (÷3)

x= 10

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