Would you simply show me which one of the following bold parts you would use?
Something must be taken into account.
Something must to be taken into account.
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It sounds rather weird to say that "something must to be taken into account". Nor do we find the use of "to" after must in a dictionary or grammar book. The grammar says that we usually use an infinitive (the basic form of a verb) without to after the auxiliary "must".
So the right sentence is "something must be taken into account.