Question

86-[15x-7(6x-9)-2{10x-5(2-3x)}]

Answer 1

86-[15x-7(6x-9)-2{10x-5(2-3x)}]
86-[15x-7(6x-9)-2{10x-10+15x}]
86-[15x-7(6x-9)-2{25x-10}]
86-[15x-7(6x-9)-50x+20}]
86-[15x-42x+63-50x+20]
86-[-77x+83]
86+77x-83
77x+3

Answer 2

86 - [ 15x - 7(6x - 9) - 2{10x - 5(2 - 3x)}]

= 86 - [ 15 x - 42x + 63 - 2{10x - 10 + 15x}]

= 86 - (15x - 42x + 63 - 20x + 20 - 30x)

= 86 - (- 27x + 63 – 20x + 20 - 30x)

= 86 - (- 27x - 30x -20x+ 63 + 20 )

= 86 - (- 57x -20x+ 63 + 20 )

= 86 - (-77x + 83)

= 86 + 77x - 83

= 77x +86 -83

= 77x +3

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Hope this will help you....