Solve for d
d\neq 0
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d^{2}=1dd
Variable d cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by d.
d^{2}=1d^{2}
Multiply d and d to get d^{2}.
d^{2}-d^{2}=0
Subtract 1d^{2} from both sides.
0=0
Combine d^{2} and -d^{2} to get 0.
\text{true}
Compare 0 and 0.
d\in \mathrm{R}
This is true for any d.
d\in \mathrm{R}\setminus 0
Variable d cannot be equal to 0.
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