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To keep it balanced, whatever you do to one side of the equals, do to the other:

2d + 7 = 9

⇒ 2d + 7 - 7 = 9 - 7

⇒ 2d = 2

⇒ 2d ÷ 2 = 2 ÷ 2

⇒ d = 1

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12y ago

What else can I help you with?