Respuesta :
Your answer is D!
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10 - 28x = 3 + 56x
10 = 3 + 56x + 28x
10 = 3 + 84x
10 - 3 = 84x
7 = 84x
7/84 = x
1/12 = x
X = 1/12
10 = 3 + 56x + 28x
10 = 3 + 84x
10 - 3 = 84x
7 = 84x
7/84 = x
1/12 = x
X = 1/12