40+d=-20-4d

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Solution for 40+d=-20-4d equation: 



40+d=-20-4d

We move all terms to the left:

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

We add all the numbers together, and all the variables

d-(-4d-20)+40=0

We get rid of parentheses

d+4d+20+40=0

We add all the numbers together, and all the variables

5d+60=0

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

5d=-60

d=-60/5

d=-12

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