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7d*d+5=0
We simplify the equation to the form, which is simple to understand
7d*d+5=0
We move all terms containing d to the left and all other terms to the right.
+1d=0-5
We simplify left and right side of the equation.
+1d=-5
We divide both sides of the equation by 1 to get d.
d=-5
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