Consider rearranging the sentence: ‘The substituted fixtures are believed to be [‘equally valuable’ = ‘of equal value’ = ‘equal in value’]. The three options mean the same. By adding "They", it needed to be rearranged but the three options still apply.
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onizoThey believe the substituted fixtures to be of equal value.= They believe that the substituted fixtures are of equal value.
onizoHe is of ...You can use fraze.it to find examples.