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d/21=1.5/3.5
We simplify the equation to the form, which is simple to understand
d/21=1.5/3.5
We move all terms containing d to the left and all other terms to the right.
+ 0.047619047619048d=0.42857142857143
We simplify left and right side of the equation.
+ 0.047619047619048d=0.42857142857143
We divide both sides of the equation by 0.047619047619048 to get d.
d=9
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