-2(d-1)=-18

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Solution for -2(d-1)=-18 equation: 



-2(d-1)=-18

We move all terms to the left:

-2(d-1)-(-18)=0

We add all the numbers together, and all the variables

-2(d-1)+18=0

We multiply parentheses

-2d+2+18=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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