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0=1+2d
We simplify the equation to the form, which is simple to understand
0=1+2d
We move all terms containing d to the left and all other terms to the right.
-2d=+1-0
We simplify left and right side of the equation.
-2d=+1
We divide both sides of the equation by -02 to get d.
d=-0.5
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