bonjour
( 1/7 - 1/4 ) * ( 5/2 + 1 /6 )
= ( 4/28 - 7/28 ) * ( 15/6 + 1 /6 )
= - 3 /28 * 16/6
= - 48/168
= - 2/7
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bonjour
( 1/7 - 1/4 ) * ( 5/2 + 1 /6 )
= ( 4/28 - 7/28 ) * ( 15/6 + 1 /6 )
= - 3 /28 * 16/6
= - 48/168
= - 2/7