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5d+4-2d=9
We simplify the equation to the form, which is simple to understand
5d+4-2d=9
We move all terms containing d to the left and all other terms to the right.
+5d-2d=+9-4
We simplify left and right side of the equation.
+3d=+5
We divide both sides of the equation by 3 to get d.
d=1.66666666667
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