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-8(-2d+7)+9=0
We simplify the equation to the form, which is simple to understand
-8(-2d+7)+9=0
Reorder the terms in parentheses
+(+16d-56)+9=0
Remove unnecessary parentheses
+16d-56+9=0
We move all terms containing d to the left and all other terms to the right.
+16d=0+56-9
We simplify left and right side of the equation.
+16d=+47
We divide both sides of the equation by 16 to get d.
d=2.9375
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