90+6d+7+9d-7=180

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Solution for 90+6d+7+9d-7=180 equation: 



90+6d+7+9d-7=180

We move all terms to the left:

90+6d+7+9d-7-(180)=0

We add all the numbers together, and all the variables

15d-90=0

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

15d=90

d=90/15

d=6

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