U4x+9=21

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Solution for U4x+9=21 equation: 



4U+9=21

We move all terms to the left:

4U+9-(21)=0

We add all the numbers together, and all the variables

4U-12=0

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

4U=12

U=12/4

U=3

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