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9(2d+1)-5(12-3d)=12d
We simplify the equation to the form, which is simple to understand
9(2d+1)-5(12-3d)=12d
Reorder the terms in parentheses
+(+18d+9)-5*(12-3d)=12d
Remove unnecessary parentheses
+18d+9-5+*(+12-3d+)=+12d
Reorder the terms in parentheses
+18d+9+(-60+15d)=12d
Remove unnecessary parentheses
+18d+9-60+15d=+12d
We move all terms containing d to the left and all other terms to the right.
+18d+15d-12d=-9+60
We simplify left and right side of the equation.
+21d=+51
We divide both sides of the equation by 21 to get d.
d=2.42857142857
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