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d/3-9=-12
We simplify the equation to the form, which is simple to understand
d/3-9=-12
Simplifying:
+ 0.333333333333d-9=-12
We move all terms containing d to the left and all other terms to the right.
+ 0.333333333333d=-12+9
We simplify left and right side of the equation.
+ 0.333333333333d=-3
We divide both sides of the equation by 0.333333333333 to get d.
d=-9
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