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9d-9=3d-1.8
We simplify the equation to the form, which is simple to understand
9d-9=3d-1.8
We move all terms containing d to the left and all other terms to the right.
+9d-3d=-1.8+9
We simplify left and right side of the equation.
+6d=+7.2
We divide both sides of the equation by 6 to get d.
d=1.2
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