2u+9=21

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Solution for 2u+9=21 equation: 



2u+9=21

We move all terms to the left:

2u+9-(21)=0

We add all the numbers together, and all the variables

2u-12=0

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

2u=12

u=12/2

u=6

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