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1.8=d-2.8
We move all terms to the left:
1.8-(d-2.8)=0
We get rid of parentheses
-d+2.8+1.8=0
We add all the numbers together, and all the variables
-1d+4.6=0
We move all terms containing d to the left, all other terms to the right
-d=-4.6
d=-4.6/-1
d=4+0.6/1
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