7. Simplify the following. (a) 15 + 7 - (8 + 4 * 5) - 2
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15 + 7 - (8 + 4 * 5) - 2
15 + 7 - (8 + 4 * 5) - 2=> 15 + 7 - 28 -2
15 + 7 - (8 + 4 * 5) - 2=> 15 + 7 - 28 -2=> 22 - 28 - 2
15 + 7 - (8 + 4 * 5) - 2=> 15 + 7 - 28 -2=> 22 - 28 - 2 => -8 ( ans )
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