u/3+21=30

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Solution for u/3+21=30 equation: 



u/3+21=30

We move all terms to the left:

u/3+21-(30)=0

We add all the numbers together, and all the variables

u/3-9=0

We multiply all the terms by the denominator


u-9*3=0

We add all the numbers together, and all the variables

u-27=0

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

u=27

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