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d/0.4=0.5
We move all terms to the left:
d/0.4-(0.5)=0
We add all the numbers together, and all the variables
d/0.4-0.5=0
We multiply all the terms by the denominator
d-(0.5)*0.4=0
We add all the numbers together, and all the variables
d-0.2=0
We move all terms containing d to the left, all other terms to the right
d=0.2
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