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2.6=d+6.9
We move all terms to the left:
2.6-(d+6.9)=0
We get rid of parentheses
-d-6.9+2.6=0
We add all the numbers together, and all the variables
-1d-4.3=0
We move all terms containing d to the left, all other terms to the right
-d=4.3
d=4.3/-1
d=-4+0.3/1
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