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100d+120=190d+3230
We simplify the equation to the form, which is simple to understand
100d+120=190d+3230
We move all terms containing d to the left and all other terms to the right.
+100d-190d=+3230-120
We simplify left and right side of the equation.
-90d=+3110
We divide both sides of the equation by -90 to get d.
d=-34.5555555556
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