1. 8 + 7 - 6 x 2 + 10 - 4 ÷ 2 + 5=
18 - (2 + 3 - 1) x 3 - 18 ÷ 9 + 7=
6 x (14 - 15 ÷ 5 + 2) - 5 x 6 ÷ 10=



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