Solve for A, B, c, C (complex solution)
A=C-2c-30
B=35+3c-C
c\in \mathrm{C}
C\in \mathrm{C}
Solve for A, B, c, C
A=C-2c-30
B=35+3c-C
c\in \mathrm{R}
C\in \mathrm{R}
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