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15d+15=57
We simplify the equation to the form, which is simple to understand
15d+15=57
We move all terms containing d to the left and all other terms to the right.
+15d=+57-15
We simplify left and right side of the equation.
+15d=+42
We divide both sides of the equation by 15 to get d.
d=2.8
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