5u-9=21

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Solution for 5u-9=21 equation: 



5u-9=21

We move all terms to the left:

5u-9-(21)=0

We add all the numbers together, and all the variables

5u-30=0

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

5u=30

u=30/5

u=6

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