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9+3d=2d-12
We simplify the equation to the form, which is simple to understand
9+3d=2d-12
We move all terms containing d to the left and all other terms to the right.
+3d-2d=-12-9
We simplify left and right side of the equation.
+1d=-21
We divide both sides of the equation by 1 to get d.
d=-21
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