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7-2(10d+1)=25
We move all terms to the left:
7-2(10d+1)-(25)=0
We add all the numbers together, and all the variables
-2(10d+1)-18=0
We multiply parentheses
-20d-2-18=0
We add all the numbers together, and all the variables
-20d-20=0
We move all terms containing d to the left, all other terms to the right
-20d=20
d=20/-20
d=-1
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