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6=d/15+12
We simplify the equation to the form, which is simple to understand
6=d/15+12
We move all terms containing d to the left and all other terms to the right.
-0.066666666666667d=+12-6
We simplify left and right side of the equation.
-0.066666666666667d=+6
We divide both sides of the equation by -00.066666666666667 to get d.
d=-90
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