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9 (x - 1) + 4 [x + (5 - x) + 8] = 7 (5 - x + 4) + 3
9x - 9 + 4 [x + 5 - x + 8] = 35 - 7x + 28 + 3
9x - 9 + 4x + 20 - 4x + 32 = 35 - 7x + 31
9x + 4x - 4x + 7x = 35 + 31 + 9 - 20 - 32
16x = 23
x = 23/16 → respuesta