15d+7-7=90

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Solution for 15d+7-7=90 equation: 



15d+7-7=90

We move all terms to the left:

15d+7-7-(90)=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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