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111111111d+d=2d
We simplify the equation to the form, which is simple to understand
111111111d+d=2d
We move all terms containing d to the left and all other terms to the right.
+111111111d+1d-2d=0
We simplify left and right side of the equation.
+111111110d=0
We divide both sides of the equation by 111111110 to get d.
d=0
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