1+(n-1)*2=90

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Solution for 1+(n-1)*2=90 equation: 



1+(n-1)*2=90

We move all terms to the left:

1+(n-1)*2-(90)=0

We add all the numbers together, and all the variables

(n-1)*2-89=0

We multiply parentheses

2n-2-89=0

We add all the numbers together, and all the variables

2n-91=0

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

2n=91

n=91/2

n=45+1/2

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