Solve for d
d=6
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12-2d=0
Add 5 and 7 to get 12.
-2d=-12
Subtract 12 from both sides. Anything subtracted from zero gives its negation.
d=\frac{-12}{-2}
Divide both sides by -2.
d=6
Divide -12 by -2 to get 6.
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