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25=-8+2(d-9)
We simplify the equation to the form, which is simple to understand
25=-8+2(d-9)
Reorder the terms in parentheses
25=-8+(+2d-18)
Remove unnecessary parentheses
+25=-8+2d-18
We move all terms containing d to the left and all other terms to the right.
-2d=-8-18-25
We simplify left and right side of the equation.
-2d=-51
We divide both sides of the equation by -02 to get d.
d=25.5
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