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28.7+d=(16.2+15.4)
We move all terms to the left:
28.7+d-((16.2+15.4))=0
We add all the numbers together, and all the variables
d+28.7-((31.6))=0
We add all the numbers together, and all the variables
d-2.9=0
We move all terms containing d to the left, all other terms to the right
d=2.9
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