Respuesta :

7x-3x=7+5
4x=12
X=3
This is the answer

7x - 5 = 3x + 7

7x - 5 - 3x = 3x - 3x + 7

4x - 5 = 7

4x - 5 + 5 = 7 + 5

4x = 12

x = 12/4

x = 3 answer

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