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9d+7=16d+7(1-d)
We simplify the equation to the form, which is simple to understand
9d+7=16d+7(1-d)
Reorder the terms in parentheses
9d+7=16d+(+7-7d)
Remove unnecessary parentheses
+9d+7=+16d+7-7d
We move all terms containing d to the left and all other terms to the right.
+9d-16d+7d=+7-7
We simplify left and right side of the equation.
d=0
0=0
This equation is an identity, so all real numbers are solutions.
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