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Simplifying
2d * d = 0
Multiply d * d
2d2 = 0
Solving
2d2 = 0
Solving for variable 'd'.
Move all terms containing d to the left, all other terms to the right.
Divide each side by '2'.
d2 = 0
Simplifying
d2 = 0
Take the square root of each side:
d = {0}
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