30D+X+0.3x+0.4x=8000

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Solution for 30D+X+0.3x+0.4x=8000 equation: 



30+D+0.3D+0.4D=8000

We move all terms to the left:

30+D+0.3D+0.4D-(8000)=0

We add all the numbers together, and all the variables

1.7D-7970=0

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

1.7D=7970

D=7970/1.7

D=4688+0.400000000001/1.7

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