(15-d)2=100

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Solution for (15-d)2=100 equation: 



(15-d)2=100

We move all terms to the left:

(15-d)2-(100)=0

We add all the numbers together, and all the variables

(-1d+15)2-100=0

We multiply parentheses

-2d+30-100=0

We add all the numbers together, and all the variables

-2d-70=0

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

-2d=70

d=70/-2

d=-35

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