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0.4(d-4)=0.4d+3-8+0.5d
We move all terms to the left:
0.4(d-4)-(0.4d+3-8+0.5d)=0
We add all the numbers together, and all the variables
0.4(d-4)-(0.9d-5)=0
We multiply parentheses
0.4d-(0.9d-5)-1.6=0
We get rid of parentheses
0.4d-0.9d+5-1.6=0
We add all the numbers together, and all the variables
-0.5d+3.4=0
We move all terms containing d to the left, all other terms to the right
-0.5d=-3.4
d=-3.4/-0.5
d=6+0.4/0.5
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