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2A = 2 - 5B
2 (6 + 10B) = 2 - 5B
12 + 20B = 2 - 5B
12 + 20B + 5B = 2
25B = 2-12
25B = -10
B = -10/25
Sustituyo en A
A = 6 +10 (-10/25)
A = 6 - 100/25
A = 6 - 4
A= 2