4u+5=21

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Solution for 4u+5=21 equation: 



4u+5=21

We move all terms to the left:

4u+5-(21)=0

We add all the numbers together, and all the variables

4u-16=0

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

4u=16

u=16/4

u=4

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