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7(1+d)=14
We move all terms to the left:
7(1+d)-(14)=0
We add all the numbers together, and all the variables
7(d+1)-14=0
We multiply parentheses
7d+7-14=0
We add all the numbers together, and all the variables
7d-7=0
We move all terms containing d to the left, all other terms to the right
7d=7
d=7/7
d=1
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