Solve for d
d=8
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25-2d-2d=-7
Subtract 2d from both sides.
25-4d=-7
Combine -2d and -2d to get -4d.
-4d=-7-25
Subtract 25 from both sides.
-4d=-32
Subtract 25 from -7 to get -32.
d=\frac{-32}{-4}
Divide both sides by -4.
d=8
Divide -32 by -4 to get 8.
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