3(n-3)/2=21

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Solution for 3(n-3)/2=21 equation: 



3(n-3)/2=21

We move all terms to the left:

3(n-3)/2-(21)=0

We multiply all the terms by the denominator


3(n-3)-21*2=0

We add all the numbers together, and all the variables

3(n-3)-42=0

We multiply parentheses

3n-9-42=0

We add all the numbers together, and all the variables

3n-51=0

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

3n=51

n=51/3

n=17

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