13. Simplify:
(a) 25 - [20 - {8÷ 4- (15 - 25 ÷ 5) ÷ 2}]
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Step-by-step explanation:
25 - [20 - {8÷4 -(15 - 25÷5) ÷2}]
= 25 - [20 - { 2 - (15 - 5) ÷ 2}]
= 25 - [20 - { 2 - 10 ÷ 2}]
= 25 - [20 - { 2 - 5}]
= 25 - [20 + 3]
= 25 - 23
= 2
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