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1/9=1/d-1/12
We simplify the equation to the form, which is simple to understand
1/9=1/d-1/12
We move all terms containing d to the left and all other terms to the right.
-1d=-0.083333333333333
We simplify left and right side of the equation.
-1d=-0.083333333333333
We divide both sides of the equation by -01 to get d.
d=0.083333333333333
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