15d + 7 = 7d + 15 is an equation in one variable, d.
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Expressed algebraically, d + 7d = 8d.
-7d = 15 Therefore, d = 15/-7 d = -2.142857 recurring (that is, -2.142857142857...) or -2 and one seventh.
Commutativity.
5de+9e+7d+10e=5de+7d+19e
1. 7d-13=3d+72. 7d-20=3d3. -20=-4d4. d=55. Check your answer:7*5-13=22, 3*5+7=22D equals 5