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12.5+1.5d=4d
We simplify the equation to the form, which is simple to understand
12.5+1.5d=4d
We move all terms containing d to the left and all other terms to the right.
+1.5d-4d=-12.5
We simplify left and right side of the equation.
-2.5d=-12.5
We divide both sides of the equation by -2.5 to get d.
d=5
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