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(D)=10.4-4D
We move all terms to the left:
(D)-(10.4-4D)=0
We add all the numbers together, and all the variables
D-(-4D+10.4)=0
We get rid of parentheses
D+4D-10.4=0
We add all the numbers together, and all the variables
5D-10.4=0
We move all terms containing D to the left, all other terms to the right
5D=10.4
D=10.4/5
D=2+0.4/5
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