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16 - [ 8 + 1 + x ] = 12 - 24
16 - 8 - 1 - x = -12
- x = -12 - 7 (-1)
x = 19
Comprobando
16 - [ 8 + (1 + 19)] = -(-12+24)
16 - [ 8 + 20] = 12 - 24
16 - 28 = -12
-12 = -12