0
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76
Adding 79 to 321 gives 400 as the result(79+321).
79 + (3%) = 81.37
Sum = 79*(79+1)/2 = 79*80/2 = 3160
79 + 3 - 87 = -5
79
1,042
79 + 79 = 158
a + 79
79 + 79 = 158 / 2 = 79.