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x+y=5850
x=y+390
hacemos sustitucion x=y+390 en la primera ecuacion.
x+y=5850
y+390+y=5850
y+y=5850-390
2y=5460
y=5460
2
y=2730
si y=2730
x+y=5850
x+2730=5850
x=5850-2730
x=3120
pedro gana $ 3120 y juan gana $ 2730