Solve for k
k\in \mathrm{R}
p_{x}=0
Solve for p_x
p_{x}=0
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\left(-k\right)\frac{\mathrm{d}}{\mathrm{d}x}(\psi )=p_{x}
Swap sides so that all variable terms are on the left hand side.
-k\frac{\mathrm{d}}{\mathrm{d}x}(\psi )=p_{x}
Reorder the terms.
0=p_{x}
The equation is in standard form.
k\in
This is false for any k.
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