Respuesta :

Ohanainthewoods

Answer:

x = 6

Step-by-step explanation:

7x - 3x - 4 = -1 + 21

4x - 4 = 20

4x - 4 + 4 = 20 + 4

4x = 24

4x/4 = 24/4

x = 6
X=6 I believe hope this helps

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