All the examples have nouns of the same gender/number on both ends of the sentence. What if it was "Maria es igual de alt_ que los gemelos"? Is it "alta" because Maria, or is "altos" because "los gemelos"?
I just added an extra sentence in the first block of examples showing singular and plural nouns in the comparison so it's clear that the adjective needs to agree with the first noun.
Gracias y saludos
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