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9*d*10=210
We simplify the equation to the form, which is simple to understand
9*d*10=210
We move all terms containing d to the left and all other terms to the right.
+90d=+210
We simplify left and right side of the equation.
+90d=+210
We divide both sides of the equation by 90 to get d.
d=2.3333333333333
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