u/3+13=21

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Solution for u/3+13=21 equation: 



u/3+13=21

We move all terms to the left:

u/3+13-(21)=0

We add all the numbers together, and all the variables

u/3-8=0

We multiply all the terms by the denominator


u-8*3=0

We add all the numbers together, and all the variables

u-24=0

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

u=24

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