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21=-3(2d-5)
We simplify the equation to the form, which is simple to understand
21=-3(2d-5)
Reorder the terms in parentheses
21=+(-6d+15)
Remove unnecessary parentheses
+21=-6d+15
We move all terms containing d to the left and all other terms to the right.
+6d=+15-21
We simplify left and right side of the equation.
+6d=-6
We divide both sides of the equation by 06 to get d.
d=-1
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