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a + b + c = 290
a = 3c + 50
b = 2c
entonces:
(3c + 50) + (2c) + c = 290
6c + 50 = 290
6c = 290 - 50
6c = 240
c = 240/6
c = 40
y
a = 3 (40) + 50
a = 120 + 50
a = 170
b = 2 (40)
b = 80
en resumen:
a = 170
b = 80
c = 40