7+9d=7d-7

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Solution for 7+9d=7d-7 equation: 



7+9d=7d-7

We move all terms to the left:

7+9d-(7d-7)=0

We get rid of parentheses

9d-7d+7+7=0

We add all the numbers together, and all the variables

2d+14=0

We move all terms containing d to the left, all other terms to the right

2d=-14

d=-14/2

d=-7

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