Solve for D
D=1
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D^{2}-D^{2}+D-1=0
Multiply D and D to get D^{2}.
D-1=0
Combine D^{2} and -D^{2} to get 0.
D=1
Add 1 to both sides. Anything plus zero gives itself.
Examples
Quadratic equation
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Matrix
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Limits
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