15d-11d-d-d=20

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Solution for 15d-11d-d-d=20 equation: 



15d-11d-d-d=20

We move all terms to the left:

15d-11d-d-d-(20)=0

We add all the numbers together, and all the variables

2d-20=0

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

2d=20

d=20/2

d=10

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