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-d/5=1-4
We simplify the equation to the form, which is simple to understand
-d/5=1-4
We move all terms containing d to the left and all other terms to the right.
-0.2d=+1-4
We simplify left and right side of the equation.
-0.2d=-3
We divide both sides of the equation by -0.2 to get d.
d=15
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