Respuesta :

gkvai3329

Answer:

solution;

21=7x-4x

21=3x

21x/3x

Then finalay aneswer is 7x
4x = 7x -21
4x - 7x = -21
-3x = -21
X = 7

Check your work for your reason
4(7) = 7 (7) -21
28 = 49-21
28 = 28
They equal

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