n-1+n-2=120

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Solution for n-1+n-2=120 equation: 



n-1+n-2=120

We move all terms to the left:

n-1+n-2-(120)=0

We add all the numbers together, and all the variables

2n-123=0

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

2n=123

n=123/2

n=61+1/2

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