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13d-5=3(3d+7)
We simplify the equation to the form, which is simple to understand
13d-5=3(3d+7)
Reorder the terms in parentheses
13d-5=+(+9d+21)
Remove unnecessary parentheses
+13d-5=+9d+21
We move all terms containing d to the left and all other terms to the right.
+13d-9d=+21+5
We simplify left and right side of the equation.
+4d=+26
We divide both sides of the equation by 4 to get d.
d=6.5
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