86-[15x-7(6x-9)-2{10x-5(2-3x)}]
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86-[15×-7(6×-9)-2{10×-5(2×-3)}]
=86-[15×-7(-54)-2{10×-5(-6)}]
=86-[15×378-2{10×30}]
=86-[15×378-2×300]
=86-[5670-600]
=86-5070
=-4984
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