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d+4(d+4)+5d=6
We move all terms to the left:
d+4(d+4)+5d-(6)=0
We add all the numbers together, and all the variables
6d+4(d+4)-6=0
We multiply parentheses
6d+4d+16-6=0
We add all the numbers together, and all the variables
10d+10=0
We move all terms containing d to the left, all other terms to the right
10d=-10
d=-10/10
d=-1
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