The number of real solutions of the equation $\mathrm{e}^{4 \mathrm{x}}+4 \mathrm{e}^{3 \mathrm{x}}-58 \mathrm{e}^{2 \mathrm{x}}+4 \mathrm{e}^{\mathrm{x}}+1=0$ is $\_\_\_\_$ .
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