U+9=4u-9

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Solution for U+9=4u-9 equation: 



+9=4U-9

We move all terms to the left:

+9-(4U-9)=0

We get rid of parentheses

-4U+9+9=0

We add all the numbers together, and all the variables

-4U+18=0

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

-4U=-18

U=-18/-4

U=4+1/2

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