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13=5+3d-13
We simplify the equation to the form, which is simple to understand
13=5+3d-13
We move all terms containing d to the left and all other terms to the right.
-3d=+5-13-13
We simplify left and right side of the equation.
-3d=-21
We divide both sides of the equation by -03 to get d.
d=7
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