In ΔCDE, \text{m}\angle C = (x-4)^{\circ}m∠C=(x−4)
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, \text{m}\angle D = (9x+4)^{\circ}m∠D=(9x+4)
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, and \text{m}\angle E = (2x+12)^{\circ}m∠E=(2x+12)
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. Find \text{m}\angle D.m∠D.