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7-2(1-4d)=-18
We move all terms to the left:
7-2(1-4d)-(-18)=0
We add all the numbers together, and all the variables
-2(-4d+1)+7-(-18)=0
We add all the numbers together, and all the variables
-2(-4d+1)+25=0
We multiply parentheses
8d-2+25=0
We add all the numbers together, and all the variables
8d+23=0
We move all terms containing d to the left, all other terms to the right
8d=-23
d=-23/8
d=-2+7/8
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