20+20-12d=18d-20

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



20+20-12d=18d-20

We move all terms to the left:

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

We add all the numbers together, and all the variables

-12d-(18d-20)+40=0

We get rid of parentheses

-12d-18d+20+40=0

We add all the numbers together, and all the variables

-30d+60=0

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

-30d=-60

d=-60/-30

d=+2

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