7d+9=90

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Solution for 7d+9=90 equation: 



7d+9=90

We move all terms to the left:

7d+9-(90)=0

We add all the numbers together, and all the variables

7d-81=0

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

7d=81

d=81/7

d=11+4/7

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