8b- [15x – 7 (6x – 9) – 2 {10x – 5 (2 – 3x)}}
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Step-by-step explanation:
8b- [15x - 7 (6x- 9) - 2 {10x - 5 (2 - 3x)}]
= 8b- [ 15x - 42x + 63 - 2 {10x - 10 +15x}]
= 8b - [ 15x - 42x + 63 - 2 {25x -10}]
= 8b -[ 15x - 42x +63 - 50x + 20]
= 8b - [- 77x +83]
= 8b + 77x + 83
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