2^x+1 + 2^x + 2^x-1 =112
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Por propiedades de producto de potencias de igual base:
2^x . 2 + 2^x + 2^x / 2 = 112
(2 + 1 + 1/2) . 2^x = 112
7/2 . 2^x = 112
2^x = 2 . 112 / 7 = 32
O sea x = 5
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