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7+6(1+4d)=20
We move all terms to the left:
7+6(1+4d)-(20)=0
We add all the numbers together, and all the variables
6(4d+1)+7-20=0
We add all the numbers together, and all the variables
6(4d+1)-13=0
We multiply parentheses
24d+6-13=0
We add all the numbers together, and all the variables
24d-7=0
We move all terms containing d to the left, all other terms to the right
24d=7
d=7/24
d=7/24
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