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20d + 13 - 12d = -34
We simplify the equation to the form, which is simple to understand
20d+13-12d=-34
We move all terms containing d to the left and all other terms to the right.
+20d-12d=-34-13
We simplify left and right side of the equation.
+8d=-47
We divide both sides of the equation by 8 to get d.
d=-5.875
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