9+20d=89

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Solution for 9+20d=89 equation:



9+20d=89
We move all terms to the left:
9+20d-(89)=0
We add all the numbers together, and all the variables
20d-80=0
We move all terms containing d to the left, all other terms to the right
20d=80
d=80/20
d=4

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