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20-.20=.30d+16
We simplify the equation to the form, which is simple to understand
20-.20=.30d+16
We move all terms containing d to the left and all other terms to the right.
-0.3d=+16-20 + 0.2
We simplify left and right side of the equation.
-0.3d=-3.8
We divide both sides of the equation by -00.3 to get d.
d=12.666666666667
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