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0.4d=-21-d
We move all terms to the left:
0.4d-(-21-d)=0
We add all the numbers together, and all the variables
0.4d-(-1d-21)=0
We get rid of parentheses
0.4d+1d+21=0
We add all the numbers together, and all the variables
1.4d+21=0
We move all terms containing d to the left, all other terms to the right
1.4d=-21
d=-21/1.4
d=-15
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