-2(d-1)=12

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Solution for -2(d-1)=12 equation: 



-2(d-1)=12

We move all terms to the left:

-2(d-1)-(12)=0

We multiply parentheses

-2d+2-12=0

We add all the numbers together, and all the variables

-2d-10=0

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

-2d=10

d=10/-2

d=-5

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