20-12d+19=-18-15d

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Solution for 20-12d+19=-18-15d equation: 



20-12d+19=-18-15d

We move all terms to the left:

20-12d+19-(-18-15d)=0

We add all the numbers together, and all the variables

-12d-(-15d-18)+20+19=0

We add all the numbers together, and all the variables

-12d-(-15d-18)+39=0

We get rid of parentheses

-12d+15d+18+39=0

We add all the numbers together, and all the variables

3d+57=0

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

3d=-57

d=-57/3

d=-19

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