1+18+7d=-9

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Solution for 1+18+7d=-9 equation: 



1+18+7d=-9

We move all terms to the left:

1+18+7d-(-9)=0

We add all the numbers together, and all the variables

7d+28=0

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

7d=-28

d=-28/7

d=-4

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