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If 16 - 7d = -3 d + 2, collecting like terms with "d" on the left side yields -4d = -14, or d = 14/4 = 7/2.
5de+9e+7d+10e=5de+7d+19e
Expressed algebraically, d + 7d = 8d.
The coefficient of 3+7d is 7
7d + 2 7 is the only coefficient