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9-3d=30-10d
We simplify the equation to the form, which is simple to understand
9-3d=30-10d
We move all terms containing d to the left and all other terms to the right.
-3d+10d=+30-9
We simplify left and right side of the equation.
+7d=+21
We divide both sides of the equation by 7 to get d.
d=3
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