U+21=u+12

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Solution for U+21=u+12 equation: 



+21=U+12

We move all terms to the left:

+21-(U+12)=0

We get rid of parentheses

-U-12+21=0

We add all the numbers together, and all the variables

-1U+9=0

We move all terms containing U to the left, all other terms to the right

-U=-9

U=-9/-1

U=+9

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