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25=d+12-4d
We simplify the equation to the form, which is simple to understand
25=d+12-4d
We move all terms containing d to the left and all other terms to the right.
-1d+4d=+12-25
We simplify left and right side of the equation.
+3d=-13
We divide both sides of the equation by 3 to get d.
d=-4.33333333333
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