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4d+2d=3(d+9)
We simplify the equation to the form, which is simple to understand
4d+2d=3(d+9)
Reorder the terms in parentheses
4d+2d=+(+3d+27)
Remove unnecessary parentheses
+4d+2d=+3d+27
We move all terms containing d to the left and all other terms to the right.
+4d+2d-3d=+27
We simplify left and right side of the equation.
+3d=+27
We divide both sides of the equation by 3 to get d.
d=9
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