[tex]11u - 12 = 20 - 5u \\ 11u - 12 + 5u = 20 \\ 11u + 5u = 20 + 12 \\ 16u = 20 + 12 \\ 16u = 32 \\ u = 32 \div 16 \\ u = 2[/tex]
[tex] \blue{feliz \: navidad} [/tex]
