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d-2.8=-12.8
We simplify the equation to the form, which is simple to understand
d-2.8=-12.8
We move all terms containing d to the left and all other terms to the right.
+1d=-12.8+2.8
We simplify left and right side of the equation.
+1d=-10
We divide both sides of the equation by 1 to get d.
d=-10
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