9d-99=90

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Solution for 9d-99=90 equation: 



9d-99=90

We move all terms to the left:

9d-99-(90)=0

We add all the numbers together, and all the variables

9d-189=0

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

9d=189

d=189/9

d=21

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