125 + (68 + 17) = (125 + _____ ) + 17.

Assume the number to be K.
125 + (68 + 17) = (125 + K) + 17
125 + 85 = 125 + K + 17
K = 125 + 85 – 125 – 17
K = 85 – 17
K = 68

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