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