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-d/4=2,1/4
We simplify the equation to the form, which is simple to understand
-d/4=2,1/4
We move all terms containing d to the left and all other terms to the right.
-0.25d=0.525
We simplify left and right side of the equation.
-0.25d=0.525
We divide both sides of the equation by -0.25 to get d.
d=-2.1
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