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21d-3d+13=85
We simplify the equation to the form, which is simple to understand
21d-3d+13=85
We move all terms containing d to the left and all other terms to the right.
+21d-3d=+85-13
We simplify left and right side of the equation.
+18d=+72
We divide both sides of the equation by 18 to get d.
d=4
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