21d-9=180

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Solution for 21d-9=180 equation: 



21d-9=180

We move all terms to the left:

21d-9-(180)=0

We add all the numbers together, and all the variables

21d-189=0

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

21d=189

d=189/21

d=9

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