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d - 4d = d + 1 - 4d
We simplify the equation to the form, which is simple to understand
d-4d=d+1-4d
We move all terms containing d to the left and all other terms to the right.
+1d-4d-1d+4d=+1
We simplify left and right side of the equation.
d=+1
0=1
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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