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7d-d+11d-13d+3d=12
We simplify the equation to the form, which is simple to understand
7d-d+11d-13d+3d=12
We move all terms containing d to the left and all other terms to the right.
+7d-1d+11d-13d+3d=+12
We simplify left and right side of the equation.
+7d=+12
We divide both sides of the equation by 7 to get d.
d=1.71428571429
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