(50 + 23) + 17 = 50 + (23 + 17) = 50 + 40 = 90
13 + (12 + 35) = (13 + 12) + 35 = 25 + 35 = 60
100 - (25 - 25) = 100 - 0 = 100
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(50 + 23) + 17 = 50 + (23 + 17) = 50 + 40 = 90
13 + (12 + 35) = (13 + 12) + 35 = 25 + 35 = 60
100 - (25 - 25) = 100 - 0 = 100