\left\{ \begin{array} { l } { E = m _ { C } ^ { 2 } } \\ { m = 5 } \\ { c = 2 m } \end{array} \right.
Solve for E, m_C, m, c (complex solution)
E=m_{C}^{2}
m_{C}\in \mathrm{C}
m=5
c=10
Solve for E, m_C, m, c
E=m_{C}^{2}
m_{C}\in \mathrm{R}
m=5
c=10
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