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3.4-2.8d=2.8d-1.3
We move all terms to the left:
3.4-2.8d-(2.8d-1.3)=0
We get rid of parentheses
-2.8d-2.8d+1.3+3.4=0
We add all the numbers together, and all the variables
-5.6d+4.7=0
We move all terms containing d to the left, all other terms to the right
-5.6d=-4.7
d=-4.7/-5.6
d=2.7647058823529/3.2941176470588
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