21+2u=47

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Solution for 21+2u=47 equation: 



21+2u=47

We move all terms to the left:

21+2u-(47)=0

We add all the numbers together, and all the variables

2u-26=0

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

2u=26

u=26/2

u=13

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