2a - {a + 2 (5 - b)}
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this is the right equation
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It is given that ,
2a - { a + 2( 5 - b ) }
= 2a - { a + 10 - 2b }
= 2a - a - 10 + 2b
= a + 2b - 10
••••
2a - { a + 2( 5 - b ) }
= 2a - { a + 10 - 2b }
= 2a - a - 10 + 2b
= a + 2b - 10
••••
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