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7(2d+3)-4d=11
We move all terms to the left:
7(2d+3)-4d-(11)=0
We add all the numbers together, and all the variables
-4d+7(2d+3)-11=0
We multiply parentheses
-4d+14d+21-11=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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