40+.40d=20+.50d

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Solution for 40+.40d=20+.50d equation: 



40+.40d=20+.50d

We move all terms to the left:

40+.40d-(20+.50d)=0

We add all the numbers together, and all the variables

.40d-(.50d+20)+40=0

We get rid of parentheses

.40d-.50d-20+40=0

We add all the numbers together, and all the variables

-0.1d+20=0

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

-0.1d=-20

d=-20/-0.1

d=+200

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