86-[15x-7(6x-9)-2{10x-5(2-3x)}]
[tex][/tex]
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86-[15×-7×-54-2 {10×-5×6}]
86-[15×-7×-54-2×-300]
86-[-105×-56×-300]
86-[5880×-300]
86-(-1764000)
1763914
86-[15×-7×-54-2×-300]
86-[-105×-56×-300]
86-[5880×-300]
86-(-1764000)
1763914
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