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0.15d+0.007(1000-d)=130
We move all terms to the left:
0.15d+0.007(1000-d)-(130)=0
We add all the numbers together, and all the variables
0.15d+0.007(-1d+1000)-130=0
We multiply parentheses
0.15d-0.007d+7-130=0
We add all the numbers together, and all the variables
0.143d-123=0
We move all terms containing d to the left, all other terms to the right
0.143d=123
d=123/0.143
d=860+0.02000000000001/0.143
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