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3 / 8 + 7 / 12, find lowest common denominator
8 = 2 * 2 * 2 = 2^3
12 = 2 * 2 * 3 = 2^2, 3^1
so 2*2*2*3 = lcm = 24
so 9 / 24 + 14 / 24 = 23 / 24
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