\left\{ \begin{array} { l } { A = 2 } \\ { A + 4 = 3 ( c + 4 ) } \\ { A + B + C = 78 } \end{array} \right.
Solve for A, c, B, C (complex solution)
A=2
c=-2
B=76-C
C\in \mathrm{C}
Solve for A, c, B, C
A=2
c=-2
B=76-C
C\in \mathrm{R}
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