9d+9=99

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Solution for 9d+9=99 equation: 



9d+9=99

We move all terms to the left:

9d+9-(99)=0

We add all the numbers together, and all the variables

9d-90=0

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

9d=90

d=90/9

d=10

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