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-4d+2(3+d)=16
We move all terms to the left:
-4d+2(3+d)-(16)=0
We add all the numbers together, and all the variables
-4d+2(d+3)-16=0
We multiply parentheses
-4d+2d+6-16=0
We add all the numbers together, and all the variables
-2d-10=0
We move all terms containing d to the left, all other terms to the right
-2d=10
d=10/-2
d=-5
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