d=d-9

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Solution for d=d-9 equation: 


Simplifying
d = d + -9

Reorder the terms:
d = -9 + d

Add '-1d' to each side of the equation.
d + -1d = -9 + d + -1d

Combine like terms: d + -1d = 0
0 = -9 + d + -1d

Combine like terms: d + -1d = 0
0 = -9 + 0
0 = -9

Solving
0 = -9

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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