Answer
52
Work Step by Step
20-3(1) + 20-3(2) + 20-3(3) + 20-3(4) + 20-3(5) + 20-3(6) + 20-3(7) + 20-3(8) = 17 + 14 + 11 + 8 + 5 + 2 + -1 + -4 = 52
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