1-2d=9

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Solution for 1-2d=9 equation: 



1-2d=9

We move all terms to the left:

1-2d-(9)=0

We add all the numbers together, and all the variables

-2d-8=0

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

-2d=8

d=8/-2

d=-4

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