Respuesta :

The answer is D. Here's my work:

12x - 6 = 4x
12x-4x = 6
8x = 6
x = 3/4
3xy - 6 = 4x....when y = 4
3x(4) - 6 = 4x
12x - 6 = 4x
-6 = 4x - 12x
-6 = - 8x
-6/-8 = x
3/4 = x <===
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