Respuesta :

Answer:

x = 10.

Step-by-step explanation:

8/12 = (x + 4)/(2x + 1)   Simplify 8/12:

2/3 = (x + 4)/(2x + 1)    Cross multiply:

2(2x + 1) = 3(x + 4)

4x + 2 = 3x + 12

x = 10.

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