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28d+11-4d=-3(-8d-7)
We simplify the equation to the form, which is simple to understand
28d+11-4d=-3(-8d-7)
Reorder the terms in parentheses
28d+11-4d=+(+24d+21)
Remove unnecessary parentheses
+28d+11-4d=+24d+21
We move all terms containing d to the left and all other terms to the right.
+28d-4d-24d=+21-11
We simplify left and right side of the equation.
d=+10
0=10
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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