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d+12.7=7.9
We simplify the equation to the form, which is simple to understand
d+12.7=7.9
We move all terms containing d to the left and all other terms to the right.
+1d=+7.9-12.7
We simplify left and right side of the equation.
+1d=-4.8
We divide both sides of the equation by 1 to get d.
d=-4.8
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