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-2/5-d=1/5
We simplify the equation to the form, which is simple to understand
-2/5-d=1/5
We move all terms containing d to the left and all other terms to the right.
-1d=0.2 + 0.4
We simplify left and right side of the equation.
-1d=0.6
We divide both sides of the equation by -1 to get d.
d=-0.6
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