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3d=13.02+5.1d
We move all terms to the left:
3d-(13.02+5.1d)=0
We add all the numbers together, and all the variables
3d-(5.1d+13.02)=0
We get rid of parentheses
3d-5.1d-13.02=0
We add all the numbers together, and all the variables
-2.1d-13.02=0
We move all terms containing d to the left, all other terms to the right
-2.1d=13.02
d=13.02/-2.1
d=-6+0.42/2.1
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