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16d-(4-5d)=-64
We simplify the equation to the form, which is simple to understand
16d-(4-5d)=-64
Remove unnecessary parentheses
16d-4+5d=-64
We move all terms containing d to the left and all other terms to the right.
+16d+5d=-64+4
We simplify left and right side of the equation.
+21d=-60
We divide both sides of the equation by 21 to get d.
d=-2.85714285714
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