-2(d-1)=15

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Solution for -2(d-1)=15 equation: 



-2(d-1)=15

We move all terms to the left:

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

We multiply parentheses

-2d+2-15=0

We add all the numbers together, and all the variables

-2d-13=0

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

-2d=13

d=13/-2

d=-6+1/2

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