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2(1-d)-(2d+1)=0
We simplify the equation to the form, which is simple to understand
2(1-d)-(2d+1)=0
Reorder the terms in parentheses
+(+2-2d)-(2d+1)=0
Remove unnecessary parentheses
+2-2d-(+2d+1+)=0
Remove unnecessary parentheses
+2-2d-2d-1=0
We move all terms containing d to the left and all other terms to the right.
-2d-2d=0-2+1
We simplify left and right side of the equation.
-4d=-1
We divide both sides of the equation by -4 to get d.
d=0.25
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