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3(d-4)+(4-d)2=16
We move all terms to the left:
3(d-4)+(4-d)2-(16)=0
We add all the numbers together, and all the variables
3(d-4)+(-1d+4)2-16=0
We multiply parentheses
3d-2d-12+8-16=0
We add all the numbers together, and all the variables
d-20=0
We move all terms containing d to the left, all other terms to the right
d=20
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