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7(2-6d)=-28
We move all terms to the left:
7(2-6d)-(-28)=0
We add all the numbers together, and all the variables
7(-6d+2)-(-28)=0
We add all the numbers together, and all the variables
7(-6d+2)+28=0
We multiply parentheses
-42d+14+28=0
We add all the numbers together, and all the variables
-42d+42=0
We move all terms containing d to the left, all other terms to the right
-42d=-42
d=-42/-42
d=1
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