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40-5(d+12)=2d
We simplify the equation to the form, which is simple to understand
40-5(d+12)=2d
Reorder the terms in parentheses
40+(-5d-60)=2d
Remove unnecessary parentheses
+40-5d-60=+2d
We move all terms containing d to the left and all other terms to the right.
-5d-2d=-40+60
We simplify left and right side of the equation.
-7d=+20
We divide both sides of the equation by -7 to get d.
d=-2.85714285714
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