Ответы на вопрос:
(( 7/12 ) + ( 11/30 )x ) : 7 ( 1/4 ) = 1/3 ( 7/12 ) + ( 11/30 ) x = ( 1/3 ) * ( 29/4 ) ( 7/12 ) + ( 11/30 ) x = 29/12 ( 11/30 ) x = ( 29/12 ) - ( 7/12 ) ( 11/30 ) x = ( 22/12 ) x = ( 11/6 ) : ( 11/30 ) x = 30/6 x = 5
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