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-0.3d+-2.8=-4
We move all terms to the left:
-0.3d+-2.8-(-4)=0
We add all the numbers together, and all the variables
-0.3d+1.2=0
We move all terms containing d to the left, all other terms to the right
-0.3d=-1.2
d=-1.2/-0.3
d=+4
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