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10d-5d=15
We simplify the equation to the form, which is simple to understand
10d-5d=15
We move all terms containing d to the left and all other terms to the right.
+10d-5d=+15
We simplify left and right side of the equation.
+5d=+15
We divide both sides of the equation by 5 to get d.
d=3
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