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0.5+0.4d=-1.8
We move all terms to the left:
0.5+0.4d-(-1.8)=0
We add all the numbers together, and all the variables
0.4d+2.3=0
We move all terms containing d to the left, all other terms to the right
0.4d=-2.3
d=-2.3/0.4
d=-5+0.3/0.4
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