19+d=-20+4d

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Solution for 19+d=-20+4d equation: 



19+d=-20+4d

We move all terms to the left:

19+d-(-20+4d)=0

We add all the numbers together, and all the variables

d-(4d-20)+19=0

We get rid of parentheses

d-4d+20+19=0

We add all the numbers together, and all the variables

-3d+39=0

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

-3d=-39

d=-39/-3

d=+13

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