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4.2=10^1-0.13d
We move all terms to the left:
4.2-(10^1-0.13d)=0
We get rid of parentheses
0.13d+4.2-10^1=0
We add all the numbers together, and all the variables
0.13d-5.8=0
We move all terms containing d to the left, all other terms to the right
0.13d=5.8
d=5.8/0.13
d=44+0.079999999999999/0.13
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