-18=-3D-7d

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Solution for -18=-3D-7d equation: 



-18=-3-7D

We move all terms to the left:

-18-(-3-7D)=0

We add all the numbers together, and all the variables

-(-7D-3)-18=0

We get rid of parentheses

7D+3-18=0

We add all the numbers together, and all the variables

7D-15=0

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

7D=15

D=15/7

D=2+1/7

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