Question
Simplify:
86 - [15x - 7(6x - 9) - 2{10x - 5(2 - 3x)}]
86 - [15x - 7(6x - 9) - 2{10x - 5(2 - 3x)}]
✓
Answer
Removing the innermost grouping symbol ( ) first, then { } and then [ ], we have:
86 - [15x - 7 (6x - 9) - 2{10x - 5(2 - 3x)}]
= 86 - [15x - 42x + 63 - 2{10x - 10 + 15x}
= 86 - [15x - 42x + 63 - 2{25x - 10}]
= 86 - [15x - 42x + 63 - 50x + 20]
= 86 - 15x + 42x - 63 + 50x - 20
= (86 - 63 - 20) - 15x + 42x + 50x
= (86 - 83) + (-15 + 42 + 50)x
= 3 + 77x
86 - [15x - 7 (6x - 9) - 2{10x - 5(2 - 3x)}]
= 86 - [15x - 42x + 63 - 2{10x - 10 + 15x}
= 86 - [15x - 42x + 63 - 2{25x - 10}]
= 86 - [15x - 42x + 63 - 50x + 20]
= 86 - 15x + 42x - 63 + 50x - 20
= (86 - 63 - 20) - 15x + 42x + 50x
= (86 - 83) + (-15 + 42 + 50)x
= 3 + 77x
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