10d+9=99

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Solution for 10d+9=99 equation: 



10d+9=99

We move all terms to the left:

10d+9-(99)=0

We add all the numbers together, and all the variables

10d-90=0

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

10d=90

d=90/10

d=9

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