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7 = -13 + d

d = 7 - (-13)

d = 20

Q: 7 equals -13 plus d

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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

If: d+7 = 5 Then: d = -2 by subtracting 7 from both sides

c = 6 and d = 7

4

Commutativity.

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the answer is a

d=17

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

If: d+7 = 5 Then: d = -2 by subtracting 7 from both sides

c = 6 and d = 7

4

Commutativity.

That's the equation.

Doc, Happy, Grumpy, Sleepy, Bashful, Sneezy and Dopey equal[s] the 7 dwarves.

10

15d + 7 = 7d + 15 is an equation in one variable, d.

2d + 7 = 9 2d = 2 d = 1