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3n/3+n=90
We move all terms to the left:
3n/3+n-(90)=0
We add all the numbers together, and all the variables
n+3n/3-90=0
We multiply all the terms by the denominator
n*3+3n-90*3=0
We add all the numbers together, and all the variables
3n+n*3-270=0
Wy multiply elements
3n+3n-270=0
We add all the numbers together, and all the variables
6n-270=0
We move all terms containing n to the left, all other terms to the right
6n=270
n=270/6
n=45
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