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7.5d=300
We simplify the equation to the form, which is simple to understand
7.5d=300
We move all terms containing d to the left and all other terms to the right.
+7.5d=+300
We simplify left and right side of the equation.
+7.5d=+300
We divide both sides of the equation by 7.5 to get d.
d=40
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