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44x+4x4+x44=1221
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Răspuns :

[tex]\overline{44x}+\overline{4x4}+\overline{x44}=1221[/tex]

[tex]400+40+x+400+10x+4+100x+40+4=1221[/tex]

[tex]111x=1221-888[/tex]

[tex]111x=333[/tex]

[tex]x=333:111[/tex]

[tex]\boxed{x=3}[/tex]