6+2u=21

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Solution for 6+2u=21 equation: 



6+2u=21

We move all terms to the left:

6+2u-(21)=0

We add all the numbers together, and all the variables

2u-15=0

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

2u=15

u=15/2

u=7+1/2

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