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10(0.4+0.5d)=4d
We move all terms to the left:
10(0.4+0.5d)-(4d)=0
We add all the numbers together, and all the variables
10(0.5d+0.4)-4d=0
We add all the numbers together, and all the variables
-4d+10(0.5d+0.4)=0
We multiply parentheses
-4d+0d+4=0
We add all the numbers together, and all the variables
-3d+4=0
We move all terms containing d to the left, all other terms to the right
-3d=-4
d=-4/-3
d=1+1/3
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