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Anonymous
It is: 2d+9
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7d + 2 < 51 7d < 49 d < 7
5de+9e+7d+10e=5de+7d+19e
Expressed algebraically, d + 7d = 8d.
The coefficient of 3+7d is 7
15d + 7 = 7d + 15 is an equation in one variable, d.