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0.4/4=d
We move all terms to the left:
0.4/4-(d)=0
We add all the numbers together, and all the variables
-1d+0.4/4=0
We multiply all the terms by the denominator
-1d*4+0.4=0
Wy multiply elements
-4d+0.4=0
We move all terms containing d to the left, all other terms to the right
-4d=-0.4
d=-0.4/-4
d=0.4/4
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