\(1\frac{5}{18}-\frac{5}{18}.\left(\frac{1}{15}+1\frac{1}{12}\right)\\ =1\frac{5}{18}-\frac{5}{18}.\frac{23}{20}\\=1\frac{5}{18}-\frac{23}{72}\\ =\frac{23}{24} \)
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