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5(4+d)-2(d+3)=20
We move all terms to the left:
5(4+d)-2(d+3)-(20)=0
We add all the numbers together, and all the variables
5(d+4)-2(d+3)-20=0
We multiply parentheses
5d-2d+20-6-20=0
We add all the numbers together, and all the variables
3d-6=0
We move all terms containing d to the left, all other terms to the right
3d=6
d=6/3
d=2
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