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.4d=2d+1.24
We simplify the equation to the form, which is simple to understand
.4d=2d+1.24
We move all terms containing d to the left and all other terms to the right.
+ 0.4d-2d=+1.24
We simplify left and right side of the equation.
-1.6d=+1.24
We divide both sides of the equation by -1.6 to get d.
d=-0.775
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